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/cmd/browser-svc/main.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+	"os/signal"
+	"strconv"
+	"syscall"
+	"time"
+
+	"github.com/gooseek/backend/internal/computer/browser"
+)
+
+func main() {
+	port := 3050
+	if p := os.Getenv("PORT"); p != "" {
+		if parsed, err := strconv.Atoi(p); err == nil {
+			port = parsed
+		}
+	}
+	if p := os.Getenv("BROWSER_SVC_PORT"); p != "" {
+		if parsed, err := strconv.Atoi(p); err == nil {
+			port = parsed
+		}
+	}
+
+	cfg := browser.ServerConfig{
+		Port:            port,
+		MaxSessions:     20,
+		SessionTimeout:  30 * time.Minute,
+		CleanupInterval: 5 * time.Minute,
+	}
+
+	server := browser.NewBrowserServer(cfg)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
+
+	go func() {
+		<-sigCh
+		log.Println("[browser-svc] Shutting down...")
+		cancel()
+	}()
+
+	log.Printf("[browser-svc] Starting browser service on port %d", port)
+	if err := server.Start(ctx); err != nil {
+		log.Fatalf("[browser-svc] Server error: %v", err)
+	}
+}