refactor(web): router-based navigation, light theme, form config

- Replace Zustand activeView with React Router (NavLink + Routes)
- White/light modern theme with indigo accents
- Sidebar with Chinese labels under icons
- ConfigForm with individual form fields (no JSON textareas)
- Account switching with context injection into chat
- Fix duplicate conversation creation with useRef guard
- Asset gallery: smaller 6-column grid with date labels
- All components updated to light color scheme

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/client/package.json

@@ -8,24 +8,26 @@
     "build": "vite build"
   },
   "dependencies": {
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.0",
+    "lucide-react": "^0.460.0",
+    "markdown-it": "^14.1.0",
     "react": "^18.3.0",
     "react-dom": "^18.3.0",
-    "zustand": "^5.0.0",
-    "lucide-react": "^0.460.0",
-    "clsx": "^2.1.0",
+    "react-router-dom": "^7.15.0",
     "tailwind-merge": "^2.6.0",
-    "class-variance-authority": "^0.7.1",
-    "markdown-it": "^14.1.0"
+    "zustand": "^5.0.0"
   },
   "devDependencies": {
+    "@types/markdown-it": "^14.1.0",
     "@types/react": "^18.3.0",
     "@types/react-dom": "^18.3.0",
-    "@types/markdown-it": "^14.1.0",
+    "@types/react-router-dom": "^5.3.3",
     "@vitejs/plugin-react": "^4.3.0",
-    "vite": "^5.4.0",
-    "tailwindcss": "^3.4.0",
-    "postcss": "^8.4.0",
     "autoprefixer": "^10.4.0",
-    "typescript": "^5.6.0"
+    "postcss": "^8.4.0",
+    "tailwindcss": "^3.4.0",
+    "typescript": "^5.6.0",
+    "vite": "^5.4.0"
   }
 }