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/services/config_profile_resolver.py

@@ -48,6 +48,7 @@ class ResolvedProfile:
     env_vars: dict[str, str] = field(default_factory=dict)
     runtime_hints: dict[str, Any] = field(default_factory=dict)
     mounts: dict[str, ResolvedMount] = field(default_factory=dict)
+    git_mounts: list[dict[str, Any]] = field(default_factory=list)
     files: dict[str, str] = field(default_factory=dict)
     env_overrides: dict[str, str] = field(default_factory=dict)
     hint_overrides: dict[str, str] = field(default_factory=dict)
@@ -168,6 +169,28 @@ def _merge_mounts(
     return result
 
 
+def _merge_git_mounts(
+    base: list[dict[str, Any]],
+    overlay: list[dict[str, Any]],
+    source_name: str,
+) -> list[dict[str, Any]]:
+    """Merge git mounts from included profiles.
+
+    Later mounts override earlier ones with the same repo_id + target_path combo.
+    """
+    result = list(base)
+    # Build lookup by (repo_id, target_path)
+    seen = {(m["repo_id"], m["target_path"]): i for i, m in enumerate(result)}
+    for mount in overlay:
+        key = (mount["repo_id"], mount["target_path"])
+        if key in seen:
+            result[seen[key]] = dict(mount)
+        else:
+            seen[key] = len(result)
+            result.append(dict(mount))
+    return result
+
+
 async def _resolve_profile_recursive(
     session: AsyncSession,
     profile_id: uuid.UUID,
@@ -244,6 +267,9 @@ async def _resolve_profile_recursive(
             result.mount_overrides,
             included.profile_name,
         )
+        result.git_mounts = _merge_git_mounts(
+            result.git_mounts, included.git_mounts, included.profile_name
+        )
 
     # Apply the profile's own settings (selected profile overrides includes)
     result.env_vars = _merge_env_vars(
@@ -270,7 +296,11 @@ async def _resolve_profile_recursive(
         result.mount_overrides,
         profile.name,
     )
-
+    result.git_mounts = _merge_git_mounts(
+        result.git_mounts,
+        profile.git_mounts or [],
+        profile.name,
+    )
     return result
 
 
@@ -449,5 +479,6 @@ def resolved_profile_to_dict(resolved: ResolvedProfile) -> dict[str, Any]:
             "files": resolved.file_overrides,
             "mounts": resolved.mount_overrides,
         },
+        "git_mounts": resolved.git_mounts,
         "included_profiles": resolved.included_profiles,
     }