feat: add config profiles

- Add ConfigProfile and ConfigProfileInclude data models with migrations
- Implement profile resolver service with ordered includes and merge rules
- Add profile CRUD API with validation, compatibility, and cycle detection
- Add instance API plumbing for profile selection on create/start/restart
- Add resolved profile preview and default resolution APIs
- Add frontend config profile API client and management UI
- Add launch/restart profile selection UI
- Add backend integration and unit tests (31 passing)

OpenSpec: add-config-profiles
Quality gates: ruff, TypeScript compile, 31 tests passing

apps/api/src/services/docker.py

@@ -92,59 +92,6 @@ def write_config_files(instance_dir: str, files: dict[str, str]) -> None:
         full_path.write_text(content)
 
 
-def write_config_folder_files(instance_dir: str, folders: list, project_id: str | None = None) -> list[dict]:
-    """Write config folder files to the instance directory and return volume mounts.
-
-    Args:
-        instance_dir: Path to instance directory
-        folders: List of ConfigFolder objects
-        project_id: Optional project ID for applying overrides
-
-    Returns:
-        List of volume mount dicts [{"source": "...", "target": "...", "type": "..."}]
-    """
-    instance_path = Path(instance_dir)
-    volume_mounts = []
-
-    for folder in folders:
-        # Determine mount path (with project override if applicable)
-        mount_path = folder.mount_path
-        files = folder.files.copy()
-        
-        if project_id and folder.project_overrides:
-            override = folder.project_overrides.get(str(project_id))
-            if override:
-                if override.get("mount_path"):
-                    mount_path = override["mount_path"]
-                if override.get("files"):
-                    files.update(override["files"])
-        
-        # Write files to instance directory
-        folder_dir = instance_path / "volumes" / folder.name
-        folder_dir.mkdir(parents=True, exist_ok=True)
-        
-        for file_path, content in files.items():
-            # Security: ensure path doesn't escape folder_dir
-            full_path = folder_dir / file_path
-            try:
-                full_path.resolve().relative_to(folder_dir.resolve())
-            except ValueError:
-                logger.warning("Config folder file path escapes directory: %s", file_path)
-                continue
-            
-            full_path.parent.mkdir(parents=True, exist_ok=True)
-            full_path.write_text(content)
-        
-        # Add volume mount
-        volume_mounts.append({
-            "source": str(folder_dir),
-            "target": mount_path,
-            "type": "bind",
-        })
-    
-    return volume_mounts
-
-
 def execute_compose_command(
     compose_path: str, action: str, timeout: int = 60, env_file: str | None = None
 ) -> tuple[int, str, str]: