feat: smart git URL parsing for browser URLs

- Add git URL parsing utilities (extract_base_repo_url, parse_git_url)
- Support GitHub, GitLab, Bitbucket browser URL detection
- Add /projects/repositories/parse-url endpoint
- Enhance repository creation to detect browser URLs and suggest corrections
- Add real-time URL validation in frontend with debouncing
- Show visual indicators (green/yellow/red) for URL validity
- Display inline suggestions with 'Use Suggested' button
- Add comprehensive unit tests for URL parsing
- Quality gates: ruff ✓, mypy ✓, typecheck ✓, lint ✓, build ✓

openspec/changes/smart-git-url-parsing/tasks.md

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+# Smart Git URL Parsing - Tasks
+
+## Phase 1: Backend URL Parsing
+
+- [ ] **Task 1.1**: Create URL parsing utilities
+  - Create `src/utils/git_url_parser.py`
+  - Implement `extract_base_repo_url()` function
+  - Support GitHub, GitLab, Bitbucket patterns
+  - Handle query parameters, branch paths, file paths
+  - Add comprehensive unit tests
+
+- [ ] **Task 1.2**: Create URL validation endpoint
+  - Add `POST /git-repositories/parse-url` endpoint
+  - Returns URLParseResult with original, base, validation status
+  - Add tests for endpoint
+
+- [ ] **Task 1.3**: Enhance repository creation endpoint
+  - Update `POST /projects/{project_id}/repositories`
+  - Detect browser URLs and return 422 with suggestion
+  - Add `force_original_url` flag to bypass suggestion
+  - Update response models
+
+## Phase 2: Frontend Implementation
+
+- [ ] **Task 2.1**: Create API client for URL parsing
+  - Add `parseGitUrl()` function to `api/git_repositories.ts`
+  - Add types for URLParseResult
+
+- [ ] **Task 2.2**: Enhance repository creation form
+  - Add real-time URL validation to input field
+  - Show visual indicators (green/yellow/red)
+  - Display inline suggestion banner
+  - Add "Use Suggested" / "Keep Original" buttons
+
+- [ ] **Task 2.3**: Create confirmation dialog
+  - Create `URLCorrectionDialog` component
+  - Shows original vs suggested URL comparison
+  - Handles accept/reject/cancel actions
+  - Integrate with repository creation flow
+
+## Phase 3: Integration & Testing
+
+- [ ] **Task 3.1**: Wire up frontend to backend
+  - Call parse-url endpoint on URL input change (debounced)
+  - Handle 422 responses from repository creation
+  - Show confirmation dialog when needed
+
+- [ ] **Task 3.2**: Add error handling
+  - Handle network errors during URL validation
+  - Show clear error messages for unsupported URLs
+  - Handle clone failures gracefully
+
+- [ ] **Task 3.3**: Run quality gates
+  - Backend: ruff, mypy, pytest
+  - Frontend: typecheck, lint, build
+
+- [ ] **Task 3.4**: Manual testing
+  - Test with GitHub URLs (tree, blob, pull)
+  - Test with GitLab URLs (-/tree, -/blob)
+  - Test with valid git URLs (should pass through)
+  - Test force_original_url flag