fix: remove backend placeholders

frontend/src/app/canvas/CanvasPage.tsx

@@ -194,16 +194,6 @@ export function CanvasPage({ projectId }: CanvasPageProps) {
   graphRef.current.nodes = nodes
   graphRef.current.edges = edges
 
-  const [apiTodosCount, setApiTodosCount] = React.useState<number | null>(null)
-  React.useEffect(() => {
-    fetch('/api/todos')
-      .then((r) => r.json())
-      .then((data: unknown) => {
-        if (Array.isArray(data)) setApiTodosCount(data.length)
-      })
-      .catch(() => setApiTodosCount(-1))
-  }, [])
-
   const pendingChangesRef = useRef<NodeChange<Node>[]>([])
   const rafRef = useRef<number | null>(null)
   const onNodesChange = useCallback(
@@ -644,11 +634,6 @@ export function CanvasPage({ projectId }: CanvasPageProps) {
         canCopy={selectedNodes.length === 1}
         onFitView={() => flowActionsRef.current?.fitView?.()}
       />
-      {apiTodosCount !== null && (
-        <div className="shrink-0 px-3 py-1 text-xs text-muted-foreground border-b border-border/50">
-          Backend API: {apiTodosCount >= 0 ? `${apiTodosCount} todos` : 'unavailable'}
-        </div>
-      )}
       <div className="flex-1 min-h-0 relative flex flex-col">
         <div className="flex-1 min-h-0 flex flex-col">
           <GraphContext.Provider value={graphContextValue}>

frontend/vite.config.ts

@@ -8,14 +8,6 @@ export default defineConfig({
   server: {
     proxy: {
       // Backend API (dev): proxy to avoid CORS
-      '/api/todos': {
-        target: 'http://localhost:8080',
-        changeOrigin: true,
-      },
-      '/api/todos/': {
-        target: 'http://localhost:8080',
-        changeOrigin: true,
-      },
       '/health': {
         target: 'http://localhost:8080',
         changeOrigin: true,