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/Core/Events/AfterControllerExecution.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Core\Events;
+
+use App\Framework\Http\Request;
+use App\Framework\Http\Response;
+use App\Framework\Core\ValueObjects\Timestamp;
+use App\Framework\Core\ValueObjects\Duration;
+use App\Framework\Core\ValueObjects\ClassName;
+use App\Framework\Core\ValueObjects\MethodName;
+
+final readonly class AfterControllerExecution
+{
+    public readonly Timestamp $timestamp;
+
+    public function __construct(
+        public Request $request,
+        public Response $response,
+        public ClassName $controllerClass,
+        public MethodName $methodName,
+        public Duration $executionTime,
+        ?Timestamp $timestamp = null,
+        public array $context = []
+    ) {
+        $this->timestamp = $timestamp ?? Timestamp::now();
+    }
+}