refactor: consolidate file path validation patterns and support scoped packages

- Extract file path validation regex into ValidationPatterns::FILE_PATH_PATTERN constant
- Add filePathRules() and filePathMessages() helper methods for reusable validation
- Extend allowed characters from [a-zA-Z0-9._\-/] to [a-zA-Z0-9._\-/~@+] to support:
  - Scoped npm packages (@org/package)
  - Language-specific directories (c++, rust+)
  - Version markers (v1~, build~)
- Replace duplicate inline regex patterns across multiple files
- Add tests for paths with @ symbol and tilde/plus characters

app/Livewire/Project/New/GithubPrivateRepository.php

@@ -168,7 +168,7 @@ class GithubPrivateRepository extends Component
                 'selected_repository_owner' => 'required|string|regex:/^[a-zA-Z0-9\-_]+$/',
                 'selected_repository_repo' => 'required|string|regex:/^[a-zA-Z0-9\-_\.]+$/',
                 'selected_branch_name' => ['required', 'string', new ValidGitBranch],
-                'docker_compose_location' => ['nullable', 'string', 'max:255', 'regex:/^\/[a-zA-Z0-9._\-\/]+$/'],
+                'docker_compose_location' => \App\Support\ValidationPatterns::filePathRules(),
             ]);
 
             if ($validator->fails()) {