feat: add config profiles

- Add ConfigProfile and ConfigProfileInclude data models with migrations
- Implement profile resolver service with ordered includes and merge rules
- Add profile CRUD API with validation, compatibility, and cycle detection
- Add instance API plumbing for profile selection on create/start/restart
- Add resolved profile preview and default resolution APIs
- Add frontend config profile API client and management UI
- Add launch/restart profile selection UI
- Add backend integration and unit tests (31 passing)

OpenSpec: add-config-profiles
Quality gates: ruff, TypeScript compile, 31 tests passing

apps/web/src/router.tsx

@@ -14,6 +14,7 @@ import { SettingsPage, GeneralSettingsTab } from "./pages/settings";
 import { TerminalPage } from "./pages/terminal";
 import { ToolWorkshopPage } from "./pages/tool-workshop";
 import { SSHKeysPage } from "./pages/ssh-keys";
+import { ConfigProfilesPage } from "./pages/config-profiles";
 import { SessionsPage } from "./pages/sessions";
 
 export const AppRouter = () => {
@@ -40,6 +41,7 @@ export const AppRouter = () => {
           <Route index element={<Navigate to="general" replace />} />
           <Route path="general" element={<GeneralSettingsTab />} />
           <Route path="ssh-keys" element={<SSHKeysPage />} />
+          <Route path="config-profiles" element={<ConfigProfilesPage />} />
           <Route path="*" element={<Navigate to="general" replace />} />
         </Route>
         <Route path="sessions" element={<SessionsPage />} />