feat(Production): Complete production deployment infrastructure

- Add comprehensive health check system with multiple endpoints
- Add Prometheus metrics endpoint
- Add production logging configurations (5 strategies)
- Add complete deployment documentation suite:
  * QUICKSTART.md - 30-minute deployment guide
  * DEPLOYMENT_CHECKLIST.md - Printable verification checklist
  * DEPLOYMENT_WORKFLOW.md - Complete deployment lifecycle
  * PRODUCTION_DEPLOYMENT.md - Comprehensive technical reference
  * production-logging.md - Logging configuration guide
  * ANSIBLE_DEPLOYMENT.md - Infrastructure as Code automation
  * README.md - Navigation hub
  * DEPLOYMENT_SUMMARY.md - Executive summary
- Add deployment scripts and automation
- Add DEPLOYMENT_PLAN.md - Concrete plan for immediate deployment
- Update README with production-ready features

All production infrastructure is now complete and ready for deployment.

resources/css/admin/07-utilities/_accessibility.css

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+/**
+ * Accessibility Utilities - Admin Interface
+ *
+ * WCAG 2.1 AA Compliance:
+ * - Enhanced focus indicators (minimum 2px outline, 3:1 contrast)
+ * - Skip links and screen reader utilities
+ * - Reduced motion preferences
+ * - Keyboard navigation enhancements
+ */
+
+@layer admin-utilities {
+    /**
+     * Focus Visible Enhancement (WCAG 2.1 Level AA)
+     *
+     * Requirement: 2.4.7 Focus Visible - All focusable elements
+     * must have a visible focus indicator with min 3:1 contrast ratio.
+     */
+    :focus-visible {
+        outline: var(--admin-focus-ring-width, 2px) solid var(--admin-focus-ring);
+        outline-offset: var(--admin-focus-ring-offset, 2px);
+        border-radius: var(--admin-radius-sm);
+    }
+
+    /**
+     * Skip to Content Link (WCAG 2.4.1)
+     *
+     * Requirement: Bypass Blocks - Provide a mechanism to bypass
+     * repeated navigation blocks.
+     */
+    .admin-skip-link {
+        position: absolute;
+        top: -9999px;
+        left: -9999px;
+        z-index: var(--admin-z-toast);
+        padding: var(--admin-spacing-md) var(--admin-spacing-lg);
+        background-color: var(--admin-accent-primary);
+        color: white;
+        text-decoration: none;
+        font-weight: var(--admin-font-weight-semibold);
+        border-radius: var(--admin-radius-md);
+        box-shadow: var(--admin-shadow-lg);
+
+        &:focus {
+            top: var(--admin-spacing-md);
+            left: var(--admin-spacing-md);
+        }
+    }
+
+    /**
+     * Screen Reader Only
+     *
+     * Visually hidden but accessible to screen readers.
+     */
+    .sr-only,
+    .admin-sr-only,
+    .visually-hidden {
+        position: absolute;
+        width: 1px;
+        height: 1px;
+        padding: 0;
+        margin: -1px;
+        overflow: hidden;
+        clip: rect(0, 0, 0, 0);
+        white-space: nowrap;
+        border-width: 0;
+    }
+
+    /**
+     * Focus Visible for Not Screen Reader Only
+     *
+     * Show element when focused (for skip links).
+     */
+    .sr-only-focusable:focus,
+    .sr-only-focusable:active {
+        position: static;
+        width: auto;
+        height: auto;
+        overflow: visible;
+        clip: auto;
+        white-space: normal;
+    }
+
+    /**
+     * Reduced Motion (WCAG 2.3.3)
+     *
+     * Respect user's motion preferences.
+     */
+    @media (prefers-reduced-motion: reduce) {
+        *,
+        *::before,
+        *::after {
+            animation-duration: 0.01ms !important;
+            animation-iteration-count: 1 !important;
+            transition-duration: 0.01ms !important;
+            scroll-behavior: auto !important;
+        }
+    }
+
+    /**
+     * Focus Within Enhancement
+     *
+     * Show focus state for container when child is focused.
+     */
+    .admin-nav__item:focus-within {
+        position: relative;
+
+        &::before {
+            content: '';
+            position: absolute;
+            left: -2px;
+            right: -2px;
+            top: -2px;
+            bottom: -2px;
+            border: 2px solid var(--admin-focus-ring);
+            border-radius: var(--admin-radius-md);
+            pointer-events: none;
+        }
+    }
+
+    /**
+     * Keyboard Navigation Indicator
+     *
+     * Show clear visual feedback for keyboard users.
+     */
+    body.user-is-tabbing *:focus {
+        outline: 3px solid var(--admin-accent-info);
+        outline-offset: 3px;
+    }
+
+    /**
+     * High Contrast Mode Support
+     *
+     * Ensure borders are visible in Windows High Contrast Mode.
+     */
+    @media (prefers-contrast: high) {
+        .admin-card,
+        .admin-sidebar,
+        .admin-header {
+            border: 2px solid currentColor;
+        }
+
+        button,
+        .admin-action-btn,
+        .admin-nav__link {
+            border: 2px solid currentColor !important;
+        }
+    }
+
+    /**
+     * Touch Target Size (WCAG 2.5.5 Level AAA, but good practice)
+     *
+     * Minimum 44x44px touch targets for mobile.
+     */
+    @media (pointer: coarse) {
+        button,
+        a,
+        input[type="checkbox"],
+        input[type="radio"],
+        .admin-action-btn,
+        .admin-nav__link {
+            min-width: 44px;
+            min-height: 44px;
+        }
+    }
+
+    /**
+     * Accessible Color Contrast Helpers
+     *
+     * WCAG AA requires:
+     * - Normal text: 4.5:1 contrast ratio
+     * - Large text (18pt+): 3:1 contrast ratio
+     * - UI components: 3:1 contrast ratio
+     */
+    .text-contrast-aa {
+        /* Ensures minimum 4.5:1 contrast */
+        color: var(--admin-content-text);
+    }
+
+    .text-contrast-large {
+        /* Large text can use lower contrast */
+        font-size: 1.125rem;
+        color: var(--admin-content-text);
+        opacity: 0.9;
+    }
+
+    /**
+     * Error Identification (WCAG 3.3.1)
+     *
+     * Errors must be communicated with more than just color.
+     */
+    .admin-error,
+    .admin-form-error {
+        color: var(--admin-accent-error);
+
+        &::before {
+            content: '⚠ ';
+            font-weight: bold;
+            margin-right: 0.25rem;
+        }
+    }
+
+    [aria-invalid="true"] {
+        border-color: var(--admin-accent-error) !important;
+        border-width: 2px !important;
+
+        /* Error icon */
+        background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="%23dc2626" stroke-width="2"><circle cx="12" cy="12" r="10"/><line x1="12" y1="8" x2="12" y2="12"/><line x1="12" y1="16" x2="12.01" y2="16"/></svg>');
+        background-repeat: no-repeat;
+        background-position: right 0.75rem center;
+        background-size: 1.25rem;
+        padding-right: 2.5rem;
+    }
+
+    /**
+     * Success/Warning States with Icons
+     *
+     * Not relying solely on color for state communication.
+     */
+    .admin-success::before {
+        content: '✓ ';
+        font-weight: bold;
+        color: var(--admin-accent-success);
+        margin-right: 0.25rem;
+    }
+
+    .admin-warning::before {
+        content: '⚠ ';
+        font-weight: bold;
+        color: var(--admin-accent-warning);
+        margin-right: 0.25rem;
+    }
+
+    .admin-info::before {
+        content: 'ℹ ';
+        font-weight: bold;
+        color: var(--admin-accent-info);
+        margin-right: 0.25rem;
+    }
+
+    /**
+     * Accessible Button States
+     */
+    button:disabled,
+    [aria-disabled="true"] {
+        opacity: 0.5;
+        cursor: not-allowed;
+        position: relative;
+
+        /* Pattern to indicate disabled state (not just opacity) */
+        &::after {
+            content: '';
+            position: absolute;
+            inset: 0;
+            background-image: repeating-linear-gradient(
+                45deg,
+                transparent,
+                transparent 5px,
+                oklch(0% 0 0 / 0.05) 5px,
+                oklch(0% 0 0 / 0.05) 10px
+            );
+            pointer-events: none;
+        }
+    }
+
+    /**
+     * Live Region Announcements
+     *
+     * For dynamic content updates.
+     */
+    .admin-live-region {
+        position: absolute;
+        left: -10000px;
+        width: 1px;
+        height: 1px;
+        overflow: hidden;
+    }
+
+    [aria-live="polite"],
+    [aria-live="assertive"] {
+        /* Screen reader will announce these */
+    }
+
+    /**
+     * Accessible Table Improvements
+     */
+    table {
+        caption {
+            font-weight: var(--admin-font-weight-semibold);
+            text-align: left;
+            padding: var(--admin-spacing-md);
+            background-color: var(--admin-bg-secondary);
+        }
+
+        th {
+            font-weight: var(--admin-font-weight-semibold);
+            text-align: left;
+        }
+
+        /* Zebra striping for better readability */
+        tbody tr:nth-child(even) {
+            background-color: var(--admin-bg-secondary);
+        }
+    }
+
+    /**
+     * Print Styles (Accessibility includes print)
+     */
+    @media print {
+        .admin-sidebar,
+        .admin-header__actions,
+        .admin-mobile-overlay,
+        .admin-sidebar__mobile-toggle {
+            display: none !important;
+        }
+
+        .admin-content {
+            max-width: 100% !important;
+            padding: 0 !important;
+        }
+
+        a[href]::after {
+            content: " (" attr(href) ")";
+            font-size: 0.875em;
+            color: var(--admin-content-text);
+        }
+
+        /* Don't show internal links */
+        a[href^="#"]::after,
+        a[href^="javascript:"]::after {
+            content: "";
+        }
+    }
+}

resources/css/admin/07-utilities/_theme-transitions.css

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+/**
+ * Theme Transition Utilities
+ *
+ * Smooth transitions when switching between light/dark themes.
+ * Respects prefers-reduced-motion for accessibility.
+ */
+
+@layer admin-utilities {
+    /**
+     * Theme Transition Class
+     *
+     * Applied to :root during theme changes for smooth color transitions.
+     * Automatically disabled when user prefers reduced motion.
+     */
+    :root {
+        /* Smooth transitions for theme changes */
+        transition:
+            background-color var(--admin-transition-base),
+            color var(--admin-transition-base),
+            border-color var(--admin-transition-base);
+    }
+
+    /* Apply transitions to all elements during theme change */
+    * {
+        transition:
+            background-color var(--admin-transition-base),
+            color var(--admin-transition-base),
+            border-color var(--admin-transition-base),
+            box-shadow var(--admin-transition-base);
+    }
+
+    /* Respect reduced motion preference */
+    @media (prefers-reduced-motion: reduce) {
+        :root,
+        * {
+            transition: none !important;
+        }
+    }
+
+    /**
+     * Theme Loading State
+     *
+     * Prevent FOUC (Flash of Unstyled Content) during initial theme load.
+     */
+    html:not([data-theme]) {
+        /* Hide content until theme is determined */
+        visibility: hidden;
+    }
+
+    html[data-theme] {
+        /* Show content once theme is set */
+        visibility: visible;
+    }
+
+    /**
+     * Theme Toggle Animation
+     *
+     * Icon rotation when toggling theme.
+     */
+    [data-theme-toggle] svg {
+        transition: transform var(--admin-transition-base);
+    }
+
+    [data-theme-toggle]:hover svg {
+        transform: rotate(20deg);
+    }
+
+    /**
+     * Dark Mode Specific Optimizations
+     */
+    [data-theme="dark"] {
+        /* Reduce brightness for dark mode images */
+        img:not([data-no-dark-mode-filter]) {
+            filter: brightness(0.9) contrast(1.1);
+        }
+
+        /* Invert logos/icons if needed */
+        .admin-sidebar__logo {
+            filter: brightness(1.2);
+        }
+    }
+
+    /**
+     * High Contrast Mode Theme Adjustments
+     *
+     * Ensure theme switching works in Windows High Contrast Mode.
+     */
+    @media (prefers-contrast: high) {
+        [data-theme="dark"] {
+            /* Increase contrast in forced colors mode */
+            --admin-bg-primary: oklch(10% 0 0);
+            --admin-content-text: oklch(100% 0 0);
+        }
+
+        [data-theme="light"] {
+            /* Ensure maximum contrast */
+            --admin-bg-primary: oklch(100% 0 0);
+            --admin-content-text: oklch(0% 0 0);
+        }
+    }
+
+    /**
+     * Print Mode Override
+     *
+     * Always use light theme for printing.
+     */
+    @media print {
+        :root,
+        [data-theme] {
+            /* Force light colors for printing */
+            --admin-bg-primary: oklch(100% 0 0);
+            --admin-content-bg: oklch(100% 0 0);
+            --admin-content-text: oklch(0% 0 0);
+            --admin-border-light: oklch(20% 0 0);
+
+            /* Remove shadows for print */
+            --admin-shadow-sm: none;
+            --admin-shadow-md: none;
+            --admin-shadow-lg: none;
+        }
+    }
+}