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/main.py

@@ -1,4 +1,3 @@
-import json
 import logging
 import os
 
@@ -15,16 +14,13 @@ from src.api.projects import router as projects_router
 from src.api.ssh_keys import router as ssh_keys_router
 from src.api.terminal import router as terminal_router
 from src.api.instance_proxy import router as instance_proxy_router
-from src.api.config_folders import router as config_folders_router
 from src.api.config_profiles import router as config_profiles_router
-from src.api.tool_configs import router as tool_configs_router
 from src.api.tool_instances import router as tool_instances_router
-from src.api.tool_instances import sessions_router
 from src.api.tool_types import router as tool_types_router
 from src.api.user_config import router as user_config_router
 from src.api.users import router as users_router
 from src.config import Settings
-from src.database import SessionLocal, init_database
+from src.database import init_database
 from src.logging_config import (
     ExceptionLoggingMiddleware,
     RequestLoggingMiddleware,
@@ -67,7 +63,9 @@ def _sanitize_validation_errors(errors):
             "type": error.get("type"),
             "loc": error.get("loc"),
             "msg": error.get("msg"),
-            "input": str(error.get("input")) if error.get("input") is not None else None,
+            "input": str(error.get("input"))
+            if error.get("input") is not None
+            else None,
         }
         # Convert ctx to safe format
         ctx = error.get("ctx")
@@ -111,12 +109,14 @@ async def on_startup():
     if not db_ready:
         logger.error("Database initialization failed. Shutting down.")
         import sys
+
         sys.exit(1)
 
     # Seed built-in data
     await seed_builtin_tool_types()
     logger.info("Startup complete.")
 
+
 app.include_router(health_router)
 app.include_router(auth_router)
 app.include_router(dashboard_router)
@@ -126,11 +126,8 @@ app.include_router(ssh_keys_router)
 app.include_router(git_repositories_router)
 app.include_router(user_config_router)
 app.include_router(tool_types_router)
-app.include_router(config_folders_router)
 app.include_router(config_profiles_router)
 app.include_router(tool_instances_router)
-app.include_router(tool_configs_router)
-app.include_router(sessions_router)
 app.include_router(instance_proxy_router)
 app.include_router(terminal_router)
 app.mount("/uploads", StaticFiles(directory="uploads"), name="uploads")