feat(FN-007): implement repository connection API and git operations

- Add GitHubAdapter and GitLabAdapter with URL parsing
- Create provider factory in apps/api/app/git/providers/
- Implement clone, fetch, push in LocalGitOperations
- Add repository_connections router with CRUD and SSH key endpoints
- Create RepositoryConnection schema with validation
- Update models and routers __init__.py for new components
- Add comprehensive tests for git operations

apps/api/app/routers/__init__.py

@@ -4,6 +4,7 @@ from app.routers.access_routes import router as access_routes_router
 from app.routers.configs import router as configs_router
 from app.routers.projects import router as projects_router
 from app.routers.repositories import router as repositories_router
+from app.routers.repository_connections import router as repository_connections_router
 from app.routers.secrets import router as secrets_router
 from app.routers.tool_definitions import router as tool_definitions_router
 from app.routers.tool_instances import router as tool_instances_router
@@ -15,6 +16,7 @@ routers: list[APIRouter] = [
     configs_router,
     projects_router,
     repositories_router,
+    repository_connections_router,
     secrets_router,
     tool_definitions_router,
     tool_instances_router,