feat(tool-configs): add frontend tool config management page

- Create ToolConfigsPage with tool type selector, config list, and add/edit form
- Support both env and file config types
- Add route /tool-configs and navigation item
- Update API client with tool config endpoints
- Build passes successfully

apps/api/src/services/docker.py

@@ -56,8 +56,44 @@ def write_compose_file(instance_dir: str, content: str) -> str:
     return str(compose_path)
 
 
+def write_env_file(instance_dir: str, env_vars: dict[str, str]) -> str:
+    """Write environment variables to a .env file.
+
+    Args:
+        instance_dir: Path to instance directory
+        env_vars: Dictionary of env var names to values
+
+    Returns:
+        Path to the env file
+    """
+    env_path = Path(instance_dir) / ".env"
+    lines = [f'{key}="{value}"' for key, value in env_vars.items()]
+    env_path.write_text("\n".join(lines) + "\n")
+    return str(env_path)
+
+
+def write_config_files(instance_dir: str, files: dict[str, str]) -> None:
+    """Write config files to the instance directory.
+
+    Args:
+        instance_dir: Path to instance directory
+        files: Dictionary of file paths (relative to instance dir) to content
+    """
+    instance_path = Path(instance_dir)
+    for file_path, content in files.items():
+        # Ensure the path is within the instance directory (security)
+        full_path = instance_path / file_path
+        try:
+            full_path.resolve().relative_to(instance_path.resolve())
+        except ValueError:
+            raise ValueError(f"File path '{file_path}' escapes instance directory")
+        
+        full_path.parent.mkdir(parents=True, exist_ok=True)
+        full_path.write_text(content)
+
+
 def execute_compose_command(
-    compose_path: str, action: str, timeout: int = 60
+    compose_path: str, action: str, timeout: int = 60, env_file: str | None = None
 ) -> tuple[int, str, str]:
     """Execute a docker compose command.
 
@@ -65,6 +101,7 @@ def execute_compose_command(
         compose_path: Path to docker-compose.yml
         action: The compose action (up, down, start, stop, restart)
         timeout: Command timeout in seconds
+        env_file: Optional path to .env file for environment variables
 
     Returns:
         Tuple of (returncode, stdout, stderr)
@@ -72,6 +109,9 @@ def execute_compose_command(
     instance_dir = Path(compose_path).parent
 
     cmd = ["docker", "compose", "-f", compose_path]
+    
+    if env_file:
+        cmd.extend(["--env-file", env_file])
 
     if action == "up":
         cmd.extend(["up", "-d"])