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.
alex
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