fix: remove legacy config APIs

Remove stale ToolConfig and ConfigFolder backend/frontend surfaces after the ConfigProfile refactor. Drop dead routers, schemas, model exports, frontend routes, clients, pages, and tests; keep ToolType API compatibility for existing interface/is_builtin response shape.

Quality gates: backend LSP diagnostics passed; backend py_compile passed; backend ruff passed; frontend ToolWorkshopPage test passed. Frontend typecheck blocked by unrelated missing xterm-addon-serialize types.

apps/api/src/services/docker/__init__.py

@@ -7,7 +7,7 @@ from .compose import (
     write_compose_file,
     write_env_file,
 )
-from .config_staging import write_config_files, write_config_folder_files
+from .config_staging import write_config_files
 from .container import (
     connect_container_to_network,
     find_free_port,
@@ -30,7 +30,6 @@ __all__ = [
     "write_env_file",
     "execute_compose_command",
     "write_config_files",
-    "write_config_folder_files",
     "get_container_id",
     "get_container_name",
     "connect_container_to_network",