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/postgres.yaml

@@ -0,0 +1,86 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: postgres
+  namespace: gooseek
+  labels:
+    app: postgres
+    app.kubernetes.io/name: postgres
+    app.kubernetes.io/part-of: gooseek
+spec:
+  serviceName: postgres
+  replicas: 1
+  selector:
+    matchLabels:
+      app: postgres
+  template:
+    metadata:
+      labels:
+        app: postgres
+    spec:
+      containers:
+      - name: postgres
+        image: postgres:16-alpine
+        env:
+        - name: POSTGRES_USER
+          valueFrom:
+            secretKeyRef:
+              name: gooseek-secrets
+              key: POSTGRES_USER
+              optional: true
+        - name: POSTGRES_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: gooseek-secrets
+              key: POSTGRES_PASSWORD
+              optional: true
+        - name: POSTGRES_DB
+          value: "gooseek"
+        - name: PGDATA
+          value: "/var/lib/postgresql/data/pgdata"
+        ports:
+        - containerPort: 5432
+          name: postgres
+        volumeMounts:
+        - name: postgres-data
+          mountPath: /var/lib/postgresql/data
+        resources:
+          requests:
+            cpu: 200m
+            memory: 256Mi
+          limits:
+            cpu: 1000m
+            memory: 1Gi
+        livenessProbe:
+          exec:
+            command: ["pg_isready", "-U", "gooseek"]
+          initialDelaySeconds: 30
+          periodSeconds: 10
+        readinessProbe:
+          exec:
+            command: ["pg_isready", "-U", "gooseek"]
+          initialDelaySeconds: 5
+          periodSeconds: 5
+  volumeClaimTemplates:
+  - metadata:
+      name: postgres-data
+    spec:
+      accessModes: ["ReadWriteOnce"]
+      storageClassName: local-path
+      resources:
+        requests:
+          storage: 10Gi
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+  namespace: gooseek
+spec:
+  type: ClusterIP
+  selector:
+    app: postgres
+  ports:
+  - port: 5432
+    targetPort: 5432
+    name: postgres