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/deploy/k8s/thread-svc.yaml

@@ -0,0 +1,63 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: thread-svc
+  namespace: gooseek
+  labels:
+    app: thread-svc
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: thread-svc
+  template:
+    metadata:
+      labels:
+        app: thread-svc
+    spec:
+      containers:
+        - name: thread-svc
+          image: gooseek/backend:latest
+          command: ["/app/thread-svc"]
+          ports:
+            - containerPort: 3027
+          envFrom:
+            - configMapRef:
+                name: gooseek-config
+            - secretRef:
+                name: gooseek-secrets
+          env:
+            - name: THREAD_SVC_PORT
+              value: "3027"
+          resources:
+            requests:
+              memory: "128Mi"
+              cpu: "100m"
+            limits:
+              memory: "512Mi"
+              cpu: "500m"
+          readinessProbe:
+            httpGet:
+              path: /ready
+              port: 3027
+            initialDelaySeconds: 5
+            periodSeconds: 10
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: 3027
+            initialDelaySeconds: 10
+            periodSeconds: 30
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: thread-svc
+  namespace: gooseek
+spec:
+  selector:
+    app: thread-svc
+  ports:
+    - port: 3027
+      targetPort: 3027
+  type: ClusterIP