feat: implement config profile git mounts

- Add git_mounts column to config_profiles table (JSONB)
- Create GitMount Pydantic models with validation
- Add repo validation in create/update endpoints
- Update profile resolver to merge git mounts from includes
- Implement auto-clone, branch checkout, and glob expansion
- Add parallel processing for git mount resolution
- Create GitMountEditor frontend component
- Update TypeScript types and API clients
- Add CSS styles for git mount UI
- Frontend type check and build pass

Implements tasks 1.1-7.9 of config-profile-git-mounts spec

apps/api/src/models/config_profile.py

@@ -39,6 +39,9 @@ class ConfigProfile(UUIDPrimaryKeyMixin, TimestampMixin, Base):
     files: Mapped[dict] = mapped_column(
         JSON, default=dict, nullable=False
     )  # {"rel/path": "content", ...}
+    git_mounts: Mapped[list] = mapped_column(
+        JSON, default=list, nullable=False
+    )  # [{"repo_id": "uuid", "source_path": ".", "target_path": "/path", "branch": "main"}, ...]
     is_default: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
 
     user: Mapped["User"] = relationship()