fix: remove tenant switcher from TopBar, fix aiProactive API double-prefix

- Remove tenant switcher dropdown from TopBar (cleanup unused vars/imports)
- Fix aiProactive.ts: remove /api/v1 prefix from apiClient calls (baseURL already includes it)
- This fixes 404 errors on /api/v1/api/v1/ai-proactive/suggestions

frontend/src/api/aiProactive.ts

@@ -21,7 +21,7 @@ export function useSuggestions() {
 
   useEffect(() => {
     // Initial load
-    apiClient.get('/api/v1/ai-proactive/suggestions').then(r => {
+    apiClient.get('/ai-proactive/suggestions').then(r => {
       setSuggestions(r.data.items);
     }).catch(() => {});
 
@@ -41,11 +41,11 @@ export function useSuggestions() {
 
   const dismiss = useCallback(async (id: string) => {
     setSuggestions(prev => prev.filter(s => s.id !== id));
-    await apiClient.post(`/api/v1/ai-proactive/suggestions/${id}/dismiss`).catch(() => {});
+    await apiClient.post(`/ai-proactive/suggestions/${id}/dismiss`).catch(() => {});
   }, []);
 
   const act = useCallback(async (id: string, actionIndex: number) => {
-    const result = await apiClient.post(`/api/v1/ai-proactive/suggestions/${id}/act`, {
+    const result = await apiClient.post(`/ai-proactive/suggestions/${id}/act`, {
       action_index: actionIndex
     });
     setSuggestions(prev => prev.map(s => s.id === id ? { ...s, is_acted_upon: true } : s));
@@ -59,11 +59,11 @@ export function useProactiveSettings() {
   const [settings, setSettings] = useState<any>(null);
 
   useEffect(() => {
-    apiClient.get('/api/v1/ai-proactive/settings').then(r => setSettings(r.data));
+    apiClient.get('/ai-proactive/settings').then(r => setSettings(r.data));
   }, []);
 
   const update = useCallback(async (updates: any) => {
-    const r = await apiClient.put('/api/v1/ai-proactive/settings', updates);
+    const r = await apiClient.put('/ai-proactive/settings', updates);
     setSettings(r.data);
     return r.data;
   }, []);