[eric] service layer improvements + URL fixes

frontend/src/app/pages/Settings/Settings.tsx

@@ -922,7 +922,7 @@ const UsageStats: React.FC = () => {
   const [stats, setStats] = useState<any>(null);
 
   useEffect(() => {
-    fetch(`${API_BASE}/analytics/usage-summary`)
+    fetch(`${API_BASE}/service/usage-summary`)
       .then(r => r.json())
       .then(setStats)
       .catch(() => {});

frontend/src/shared/state/analyticsSlice.ts

@@ -1,7 +1,7 @@
 import { createSlice, createAsyncThunk } from '@reduxjs/toolkit';
 import { API_BASE } from '@/shared/config';
 
-const ANALYTICS_API = `${API_BASE}/analytics`;
+const ANALYTICS_API = `${API_BASE}/service`;
 
 export interface UsageSummary {
   total_sessions: number;