docs: consolidate documentation into organized structure

- Move 12 markdown files from root to docs/ subdirectories
- Organize documentation by category:
  • docs/troubleshooting/ (1 file)  - Technical troubleshooting guides
  • docs/deployment/      (4 files) - Deployment and security documentation
  • docs/guides/          (3 files) - Feature-specific guides
  • docs/planning/        (4 files) - Planning and improvement proposals

Root directory cleanup:
- Reduced from 16 to 4 markdown files in root
- Only essential project files remain:
  • CLAUDE.md (AI instructions)
  • README.md (Main project readme)
  • CLEANUP_PLAN.md (Current cleanup plan)
  • SRC_STRUCTURE_IMPROVEMENTS.md (Structure improvements)

This improves:
✅ Documentation discoverability
✅ Logical organization by purpose
✅ Clean root directory
✅ Better maintainability

src/Framework/Console/TuiKeyCode.php

@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Console;
+
+/**
+ * Keyboard input codes für TUI Navigation
+ */
+enum TuiKeyCode: string
+{
+    case ARROW_UP = "\033[A";
+    case ARROW_DOWN = "\033[B";
+    case ARROW_LEFT = "\033[D";
+    case ARROW_RIGHT = "\033[C";
+    case ENTER = "\n";
+    case SPACE = " ";
+    case BACKSPACE = "\177";
+    case ESCAPE = "\033";
+    case TAB = "\t";
+    case DELETE = "\033[3~";
+    case HOME = "\033[H";
+    case END = "\033[F";
+    case PAGE_UP = "\033[5~";
+    case PAGE_DOWN = "\033[6~";
+    case F1 = "\033OP";
+
+    /**
+     * Check if this is a navigation key
+     */
+    public function isNavigationKey(): bool
+    {
+        return match($this) {
+            self::ARROW_UP, self::ARROW_DOWN, self::ARROW_LEFT, self::ARROW_RIGHT,
+            self::HOME, self::END, self::PAGE_UP, self::PAGE_DOWN => true,
+            default => false
+        };
+    }
+
+    /**
+     * Check if this is an action key
+     */
+    public function isActionKey(): bool
+    {
+        return match($this) {
+            self::ENTER, self::SPACE, self::BACKSPACE, self::ESCAPE => true,
+            default => false
+        };
+    }
+
+    /**
+     * Get human-readable description
+     */
+    public function getDescription(): string
+    {
+        return match($this) {
+            self::ARROW_UP => 'Arrow Up',
+            self::ARROW_DOWN => 'Arrow Down',
+            self::ARROW_LEFT => 'Arrow Left',
+            self::ARROW_RIGHT => 'Arrow Right',
+            self::ENTER => 'Enter',
+            self::SPACE => 'Space',
+            self::BACKSPACE => 'Backspace',
+            self::ESCAPE => 'Escape',
+            self::TAB => 'Tab',
+            self::DELETE => 'Delete',
+            self::HOME => 'Home',
+            self::END => 'End',
+            self::PAGE_UP => 'Page Up',
+            self::PAGE_DOWN => 'Page Down',
+            self::F1 => 'F1',
+        };
+    }
+}