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/web/src/router.tsx

@@ -14,7 +14,6 @@ import { SettingsPage, GeneralSettingsTab } from "./pages/SettingsPage";
 import { TerminalPage } from "./pages/TerminalPage";
 import { ToolWorkshopPage } from "./pages/ToolWorkshopPage";
 import { SSHKeysPage } from "./pages/SshKeysPage";
-import { ToolConfigsPage } from "./pages/ToolConfigsPage";
 import { ToolTypesPage } from "./pages/ToolTypesPage";
 import { SessionsPage } from "./pages/SessionsPage";
 
@@ -31,10 +30,6 @@ export const AppRouter = () => {
 				path="/tool-types"
 				element={<Navigate to="/settings/tool-types" replace />}
 			/>
-			<Route
-				path="/tool-configs"
-				element={<Navigate to="/settings/tool-configs" replace />}
-			/>
 			<Route
 				path="/"
 				element={
@@ -64,7 +59,6 @@ export const AppRouter = () => {
 					<Route path="general" element={<GeneralSettingsTab />} />
 					<Route path="ssh-keys" element={<SSHKeysPage />} />
 					<Route path="tool-types" element={<ToolTypesPage />} />
-					<Route path="tool-configs" element={<ToolConfigsPage />} />
 					<Route path="*" element={<Navigate to="general" replace />} />
 				</Route>
 				<Route path="tool-workshop" element={<ToolWorkshopPage />} />