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/Contact/ShowContact.php

@@ -15,10 +15,11 @@ use App\Framework\OpenApi\Attributes\ApiResponse;
 use App\Framework\Router\ActionResult;
 use App\Framework\Router\Result\Redirect;
 use App\Framework\Router\Result\ViewResult;
+use App\Framework\Router\WebRoutes;
 
 final readonly class ShowContact
 {
-    #[Route(path: '/kontakt', name: 'contact')]
+    #[Route(path: '/kontakt', name: WebRoutes::CONTACT)]
     public function __invoke(): ViewResult
     {
         return new ViewResult(