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/05-objects/_grid.css

@@ -0,0 +1,135 @@
+/**
+ * Grid System - Admin Interface
+ *
+ * Flexible Grid-System für Content-Layouts.
+ */
+
+@layer admin-objects {
+    /**
+     * Basic Grid
+     */
+    .admin-grid {
+        display: grid;
+        gap: var(--admin-spacing-md);
+
+        /* Default: 1 column (mobile) */
+        grid-template-columns: 1fr;
+
+        /* Tablet+: Auto-fit with min 250px columns */
+        @media (min-width: 768px) {
+            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
+        }
+    }
+
+    /**
+     * Grid Variants
+     */
+    .admin-grid--2-col {
+        @media (min-width: 768px) {
+            grid-template-columns: repeat(2, 1fr);
+        }
+    }
+
+    .admin-grid--3-col {
+        @media (min-width: 768px) {
+            grid-template-columns: repeat(2, 1fr);
+        }
+
+        @media (min-width: 1024px) {
+            grid-template-columns: repeat(3, 1fr);
+        }
+    }
+
+    .admin-grid--4-col {
+        @media (min-width: 768px) {
+            grid-template-columns: repeat(2, 1fr);
+        }
+
+        @media (min-width: 1024px) {
+            grid-template-columns: repeat(4, 1fr);
+        }
+    }
+
+    /**
+     * Gap Variants
+     */
+    .admin-grid--gap-sm {
+        gap: var(--admin-spacing-sm);
+    }
+
+    .admin-grid--gap-lg {
+        gap: var(--admin-spacing-lg);
+    }
+
+    .admin-grid--gap-xl {
+        gap: var(--admin-spacing-xl);
+    }
+
+    /**
+     * Sidebar Layout (2-column with sidebar)
+     */
+    .admin-grid--sidebar {
+        @media (min-width: 1024px) {
+            grid-template-columns: 300px 1fr;
+            gap: var(--admin-spacing-xl);
+        }
+    }
+
+    .admin-grid--sidebar-right {
+        @media (min-width: 1024px) {
+            grid-template-columns: 1fr 300px;
+            gap: var(--admin-spacing-xl);
+        }
+    }
+
+    /**
+     * Stack
+     *
+     * Vertical spacing utility.
+     */
+    .admin-stack {
+        display: flex;
+        flex-direction: column;
+        gap: var(--admin-spacing-md);
+    }
+
+    .admin-stack--sm {
+        gap: var(--admin-spacing-sm);
+    }
+
+    .admin-stack--lg {
+        gap: var(--admin-spacing-lg);
+    }
+
+    .admin-stack--xl {
+        gap: var(--admin-spacing-xl);
+    }
+
+    /**
+     * Cluster
+     *
+     * Horizontal spacing utility with wrap.
+     */
+    .admin-cluster {
+        display: flex;
+        flex-wrap: wrap;
+        gap: var(--admin-spacing-md);
+        align-items: center;
+    }
+
+    .admin-cluster--sm {
+        gap: var(--admin-spacing-sm);
+    }
+
+    .admin-cluster--lg {
+        gap: var(--admin-spacing-lg);
+    }
+
+    .admin-cluster--justify-between {
+        justify-content: space-between;
+    }
+
+    .admin-cluster--justify-end {
+        justify-content: flex-end;
+    }
+}