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/kustomization.yaml

@@ -0,0 +1,30 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: gooseek
+
+resources:
+  - namespace.yaml
+  - configmap.yaml
+  - postgres.yaml
+  - redis.yaml
+  - api-gateway.yaml
+  - chat-svc.yaml
+  - agent-svc.yaml
+  - search-svc.yaml
+  - discover-svc.yaml
+  - llm-svc.yaml
+  - scraper-svc.yaml
+  - collection-svc.yaml
+  - file-svc.yaml
+  - thread-svc.yaml
+  - computer-svc.yaml
+  - ingress.yaml
+
+commonLabels:
+  app.kubernetes.io/part-of: gooseek
+  app.kubernetes.io/managed-by: kustomize
+
+images:
+  - name: gooseek/backend
+    newTag: latest