Version 1 (#160)

New front-end
Launch Chat API
Manage Sources
Enable re-embedding of all contents
Sources can be added without a notebook now
Improved settings
Enable model selector on all chats
Background processing for better experience
Dark mode
Improved Notes

Improved Docs: 
- Remove all Streamlit references from documentation
- Update deployment guides with React frontend setup
- Fix Docker environment variables format (SURREAL_URL, SURREAL_PASSWORD)
- Update docker image tag from :latest to :v1-latest
- Change navigation references (Settings → Models to just Models)
- Update development setup to include frontend npm commands
- Add MIGRATION.md guide for users upgrading from Streamlit
- Update quick-start guide with correct environment variables
- Add port 5055 documentation for API access
- Update project structure to reflect frontend/ directory
- Remove outdated source-chat documentation files

frontend/src/lib/hooks/use-settings.ts

@@ -0,0 +1,35 @@
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
+import { settingsApi } from '@/lib/api/settings'
+import { QUERY_KEYS } from '@/lib/api/query-client'
+import { useToast } from '@/lib/hooks/use-toast'
+import { SettingsResponse } from '@/lib/types/api'
+
+export function useSettings() {
+  return useQuery({
+    queryKey: QUERY_KEYS.settings,
+    queryFn: () => settingsApi.get(),
+  })
+}
+
+export function useUpdateSettings() {
+  const queryClient = useQueryClient()
+  const { toast } = useToast()
+
+  return useMutation({
+    mutationFn: (data: Partial<SettingsResponse>) => settingsApi.update(data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: QUERY_KEYS.settings })
+      toast({
+        title: 'Success',
+        description: 'Settings updated successfully',
+      })
+    },
+    onError: () => {
+      toast({
+        title: 'Error',
+        description: 'Failed to update settings',
+        variant: 'destructive',
+      })
+    },
+  })
+}