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/Pagination/PaginationServiceInitializer.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Framework\Pagination;
+
+use App\Framework\DI\Container;
+use App\Framework\DI\Initializer;
+use App\Framework\Database\EntityManager;
+
+/**
+ * Initializer for the Pagination service
+ */
+final readonly class PaginationServiceInitializer
+{
+    public function __construct(
+        private Container $container
+    ) {
+    }
+
+    #[Initializer]
+    public function __invoke(): PaginationService
+    {
+        // Create PaginationService with EntityManager dependency
+        $paginationService = new PaginationService(
+            entityManager: $this->container->get(EntityManager::class)
+        );
+
+        // Register the service in container for future use
+        $this->container->singleton(PaginationService::class, $paginationService);
+
+        return $paginationService;
+    }
+}