feat(mcp): introduce OAuth 2.1 auth and enforce addon gating

OAuth 2.1 authentication for MCP:
- Add OAuth 2.1 authorization server with PKCE support (routes/oauth.ts)
- Add OAuth service for client CRUD, auth-code flow, and token management (services/oauthService.ts)
- Add typed scope definitions and enforcement helpers (mcp/scopes.ts)
- Add OAuth consent UI page (OAuthAuthorizePage.tsx)
- Add client-side scope labels and descriptions (api/oauthScopes.ts)
- Integrate OAuth token auth into MCP handler alongside existing static tokens
- All OAuth endpoints gated on `mcp` addon

Addon gating across MCP tools, resources, and prompts:
- Add typed ADDON_IDS constant (server/src/addons.ts) replacing all string literals
- Gate budget tools and resources (trip-budget, per-person, settlement) on `budget` addon
- Gate packing tools and resources (trip-packing, trip-packing-bags, trip-todos) on `packing` addon
- Gate todos tools on `packing` addon (mirrors web UI Lists tab behavior)
- Expand atlas gate to cover full tool body (bucket-list + country tools no longer leak)
- Expand collab gate to cover full tool body (collab notes no longer leak)
- Gate packing-list and budget-overview MCP prompts on their respective addons
- Gate get_trip_summary sections per addon; blank packing/budget/collab_notes/todos when disabled
- Remove trip-files resource and files field from get_trip_summary
- Replace all isAddonEnabled('literal') calls with ADDON_IDS constants

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/src/App.tsx

@@ -12,6 +12,7 @@ import VacayPage from './pages/VacayPage'
 import AtlasPage from './pages/AtlasPage'
 import SharedTripPage from './pages/SharedTripPage'
 import InAppNotificationsPage from './pages/InAppNotificationsPage.tsx'
+import OAuthAuthorizePage from './pages/OAuthAuthorizePage'
 import { ToastContainer } from './components/shared/Toast'
 import { TranslationProvider, useTranslation } from './i18n'
 import { authApi } from './api/client'
@@ -163,6 +164,8 @@ export default function App() {
         <Route path="/login" element={<LoginPage />} />
         <Route path="/shared/:token" element={<SharedTripPage />} />
         <Route path="/register" element={<LoginPage />} />
+        {/* OAuth 2.1 consent page — intentionally outside ProtectedRoute */}
+        <Route path="/oauth/authorize" element={<OAuthAuthorizePage />} />
         <Route
           path="/dashboard"
           element={