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/Application/SmartLink/Api/PublishSmartLink.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Application\SmartLink\Api;
+
+use App\Domain\SmartLink\Services\SmartLinkService;
+use App\Domain\SmartLink\ValueObjects\SmartLinkId;
+use App\Framework\Attributes\Route;
+use App\Framework\Http\HttpRequest;
+use App\Framework\Http\Method;
+use App\Framework\Router\Result\JsonResult;
+
+final readonly class PublishSmartLink
+{
+    public function __construct(
+        private SmartLinkService $smartLinkService
+    ) {}
+
+    #[Route(path: '/api/smart-links/{id}/publish', method: Method::POST)]
+    public function __invoke(HttpRequest $request, string $id): JsonResult
+    {
+        $smartLink = $this->smartLinkService->publishLink(new SmartLinkId($id));
+
+        return new JsonResult([
+            'id' => $smartLink->id->toString(),
+            'status' => $smartLink->status->value,
+            'published_at' => $smartLink->updatedAt->format('Y-m-d H:i:s')
+        ]);
+    }
+}