feat: Go backend, enhanced search, new widgets, Docker deploy

Major changes:
- Add Go backend (backend/) with microservices architecture
- Enhanced master-agents-svc: reranker, content-classifier, stealth-crawler,
  proxy-manager, media-search, fastClassifier, language detection
- New web-svc widgets: KnowledgeCard, ProductCard, ProfileCard, VideoCard,
  UnifiedCard, CardGallery, InlineImageGallery, SourcesPanel, RelatedQuestions
- Improved discover-svc with discover-db integration
- Docker deployment improvements (Caddyfile, vendor.sh, BUILD.md)
- Library-svc: project_id schema migration
- Remove deprecated finance-svc and travel-svc
- Localization improvements across services

Made-with: Cursor

backend/webui/package.json

@@ -0,0 +1,38 @@
+{
+  "name": "gooseek-webui",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev -p 3000",
+    "build": "next build",
+    "start": "next start -p 3000",
+    "lint": "next lint"
+  },
+  "dependencies": {
+    "@radix-ui/react-avatar": "^1.1.11",
+    "@radix-ui/react-dialog": "^1.1.15",
+    "@radix-ui/react-dropdown-menu": "^2.1.16",
+    "@radix-ui/react-scroll-area": "^1.2.10",
+    "@radix-ui/react-separator": "^1.1.8",
+    "@radix-ui/react-switch": "^1.2.6",
+    "@radix-ui/react-tabs": "^1.1.13",
+    "@radix-ui/react-tooltip": "^1.2.8",
+    "clsx": "^2.1.1",
+    "framer-motion": "^12.34.3",
+    "lucide-react": "^0.454.0",
+    "next": "^14.2.26",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "react-markdown": "^9.0.1",
+    "tailwind-merge": "^2.5.4"
+  },
+  "devDependencies": {
+    "@types/node": "^22.9.0",
+    "@types/react": "^18.3.12",
+    "@types/react-dom": "^18.3.1",
+    "autoprefixer": "^10.4.20",
+    "postcss": "^8.4.47",
+    "tailwindcss": "^3.4.14",
+    "typescript": "^5.6.3"
+  }
+}