feat: функционал скрытия подписей + fix: build output в корневой dist/

- Свитч «Подписи» в тулбаре теперь скрывает/показывает подписи
  на линиях и портах через visibility toggle
- vite outDir перенесён в ../dist для совместимости с react.Dockerfile

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

frontend/src/features/schema/SchemaCanvas.tsx

@@ -189,7 +189,7 @@ export function SchemaCanvas() {
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, []);
 
-  // Sync display settings
+  // Sync display settings: grid
   useEffect(() => {
     const graph = useSchemaStore.getState().graph;
     if (!graph) return;
@@ -201,6 +201,45 @@ export function SchemaCanvas() {
     }
   }, [displaySettings.showGrid]);
 
+  // Sync display settings: labels
+  useEffect(() => {
+    const graph = useSchemaStore.getState().graph;
+    if (!graph) return;
+
+    const show = displaySettings.showLabels;
+
+    // Toggle edge labels
+    for (const edge of graph.getEdges()) {
+      const labels = edge.getLabels();
+      if (labels.length > 0) {
+        edge.setLabels(
+          labels.map((label) => ({
+            ...label,
+            attrs: {
+              ...label.attrs,
+              label: {
+                ...(label.attrs?.label as Record<string, unknown>),
+                visibility: show ? 'visible' : 'hidden',
+              },
+              rect: {
+                ...(label.attrs?.rect as Record<string, unknown>),
+                visibility: show ? 'visible' : 'hidden',
+              },
+            },
+          })),
+        );
+      }
+    }
+
+    // Toggle port labels
+    for (const node of graph.getNodes()) {
+      const ports = node.getPorts();
+      for (const port of ports) {
+        node.setPortProp(port.id!, 'attrs/text/visibility', show ? 'visible' : 'hidden');
+      }
+    }
+  }, [displaySettings.showLabels]);
+
   return (
     <div style={{ position: 'relative', width: '100%', height: '100%' }}>
       <div