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/Makefile

@@ -0,0 +1,86 @@
+.PHONY: all build clean test dev docker-build docker-up
+
+GO=go
+GOFLAGS=-ldflags="-s -w"
+
+SERVICES=api-gateway chat-svc agent-svc search-svc llm-svc scraper-svc discover-svc collection-svc file-svc thread-svc computer-svc
+
+all: build
+
+build:
+	@for svc in $(SERVICES); do \
+		echo "Building $$svc..."; \
+		$(GO) build $(GOFLAGS) -o bin/$$svc ./cmd/$$svc; \
+	done
+
+build-%:
+	$(GO) build $(GOFLAGS) -o bin/$* ./cmd/$*
+
+clean:
+	rm -rf bin/
+
+test:
+	$(GO) test -v ./...
+
+test-coverage:
+	$(GO) test -coverprofile=coverage.out ./...
+	$(GO) tool cover -html=coverage.out -o coverage.html
+
+lint:
+	golangci-lint run ./...
+
+dev:
+	@echo "Starting development servers..."
+	@$(GO) run ./cmd/api-gateway &
+	@$(GO) run ./cmd/agent-svc &
+	@$(GO) run ./cmd/search-svc &
+	@wait
+
+dev-api-gateway:
+	$(GO) run ./cmd/api-gateway
+
+dev-agent-svc:
+	$(GO) run ./cmd/agent-svc
+
+dev-chat-svc:
+	$(GO) run ./cmd/chat-svc
+
+dev-search-svc:
+	$(GO) run ./cmd/search-svc
+
+docker-build:
+	docker build -t gooseek/api-gateway -f deploy/docker/Dockerfile.api-gateway .
+	docker build -t gooseek/agent-svc -f deploy/docker/Dockerfile.agent-svc .
+	docker build -t gooseek/search-svc -f deploy/docker/Dockerfile.search-svc .
+
+docker-up:
+	docker-compose -f deploy/docker/docker-compose.yml up -d
+
+docker-down:
+	docker-compose -f deploy/docker/docker-compose.yml down
+
+deps:
+	$(GO) mod download
+	$(GO) mod tidy
+
+generate:
+	$(GO) generate ./...
+
+# K8s commands
+k8s-deploy:
+	./deploy/k8s/deploy.sh
+
+k8s-apply:
+	kubectl apply -k deploy/k8s/
+
+k8s-delete:
+	kubectl delete -k deploy/k8s/
+
+k8s-status:
+	kubectl -n gooseek get pods,svc,ingress
+
+k8s-logs-%:
+	kubectl -n gooseek logs -f deployment/$* --all-containers
+
+k8s-restart-%:
+	kubectl -n gooseek rollout restart deployment/$*