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/pkg/config/config.go

@@ -0,0 +1,173 @@
+package config
+
+import (
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/joho/godotenv"
+)
+
+type Config struct {
+	Environment string
+	LogLevel    string
+
+	// Service ports
+	APIGatewayPort int
+	ChatSvcPort    int
+	AgentSvcPort   int
+	SearchSvcPort  int
+	LLMSvcPort     int
+	ScraperSvcPort int
+
+	// Service URLs
+	ChatSvcURL    string
+	AgentSvcURL   string
+	SearchSvcURL  string
+	LLMSvcURL     string
+	ScraperSvcURL string
+	MemorySvcURL  string
+	LibrarySvcURL string
+
+	// External services
+	SearXNGURL         string
+	SearXNGFallbackURL []string
+	Crawl4AIURL        string
+	RedisURL           string
+	DatabaseURL        string
+	DiscoverSvcURL     string
+	CollectionSvcURL   string
+	FileSvcURL         string
+	ThreadSvcURL        string
+	ComputerSvcURL      string
+	FinanceHeatmapURL   string
+	LearningSvcURL      string
+
+	// Auth
+	JWTSecret    string
+	AuthSvcURL   string
+
+	// LLM defaults
+	DefaultLLMProvider string
+	DefaultLLMModel    string
+	OpenAIAPIKey       string
+	AnthropicAPIKey    string
+	GeminiAPIKey       string
+
+	// Timeweb Cloud AI
+	TimewebAPIBaseURL     string
+	TimewebAgentAccessID  string
+	TimewebAPIKey         string
+	TimewebProxySource    string
+
+	// Timeouts
+	HTTPTimeout     time.Duration
+	LLMTimeout      time.Duration
+	ScrapeTimeout   time.Duration
+	SearchTimeout   time.Duration
+
+	// CORS
+	AllowedOrigins []string
+}
+
+var cfg *Config
+
+func Load() (*Config, error) {
+	_ = godotenv.Load()
+	_ = godotenv.Load("../.env")
+	_ = godotenv.Load("../../.env")
+
+	cfg = &Config{
+		Environment: getEnv("ENVIRONMENT", "production"),
+		LogLevel:    getEnv("LOG_LEVEL", "info"),
+
+		APIGatewayPort: getEnvInt("API_GATEWAY_PORT", 3015),
+		ChatSvcPort:    getEnvInt("CHAT_SVC_PORT", 3005),
+		AgentSvcPort:   getEnvInt("AGENT_SVC_PORT", 3018),
+		SearchSvcPort:  getEnvInt("SEARCH_SVC_PORT", 3001),
+		LLMSvcPort:     getEnvInt("LLM_SVC_PORT", 3020),
+		ScraperSvcPort: getEnvInt("SCRAPER_SVC_PORT", 3021),
+
+		ChatSvcURL:    getEnv("CHAT_SVC_URL", "http://localhost:3005"),
+		AgentSvcURL:   getEnv("MASTER_AGENTS_SVC_URL", "http://localhost:3018"),
+		SearchSvcURL:  getEnv("SEARCH_SVC_URL", "http://localhost:3001"),
+		LLMSvcURL:     getEnv("LLM_SVC_URL", "http://localhost:3020"),
+		ScraperSvcURL: getEnv("SCRAPER_SVC_URL", "http://localhost:3021"),
+		MemorySvcURL:  getEnv("MEMORY_SVC_URL", ""),
+		LibrarySvcURL: getEnv("LIBRARY_SVC_URL", "http://localhost:3009"),
+
+		SearXNGURL:         getEnv("SEARXNG_URL", "http://searxng:8080"),
+		SearXNGFallbackURL: strings.Split(getEnv("SEARXNG_FALLBACK_URL", ""), ","),
+		Crawl4AIURL:        getEnv("CRAWL4AI_URL", "http://crawl4ai:11235"),
+		RedisURL:           getEnv("REDIS_URL", "redis://localhost:6379"),
+		DatabaseURL:        getEnv("DATABASE_URL", ""),
+		DiscoverSvcURL:     getEnv("DISCOVER_SVC_URL", "http://localhost:3002"),
+		CollectionSvcURL:   getEnv("COLLECTION_SVC_URL", "http://localhost:3025"),
+		FileSvcURL:         getEnv("FILE_SVC_URL", "http://localhost:3026"),
+		ThreadSvcURL:        getEnv("THREAD_SVC_URL", "http://localhost:3027"),
+		ComputerSvcURL:      getEnv("COMPUTER_SVC_URL", "http://localhost:3030"),
+		FinanceHeatmapURL:   getEnv("FINANCE_HEATMAP_SVC_URL", "http://localhost:3033"),
+		LearningSvcURL:      getEnv("LEARNING_SVC_URL", "http://localhost:3034"),
+
+		JWTSecret:  getEnv("JWT_SECRET", ""),
+		AuthSvcURL: getEnv("AUTH_SVC_URL", ""),
+
+		DefaultLLMProvider: getEnv("DEFAULT_LLM_PROVIDER", "openai"),
+		DefaultLLMModel:    getEnv("DEFAULT_LLM_MODEL", "gpt-4o-mini"),
+		OpenAIAPIKey:       getEnv("OPENAI_API_KEY", ""),
+		AnthropicAPIKey:    getEnv("ANTHROPIC_API_KEY", ""),
+		GeminiAPIKey:       getEnv("GEMINI_API_KEY", ""),
+
+		TimewebAPIBaseURL:    getEnv("TIMEWEB_API_BASE_URL", "https://api.timeweb.cloud"),
+		TimewebAgentAccessID: getEnv("TIMEWEB_AGENT_ACCESS_ID", ""),
+		TimewebAPIKey:        getEnv("TIMEWEB_API_KEY", ""),
+		TimewebProxySource:   getEnv("TIMEWEB_X_PROXY_SOURCE", "gooseek"),
+
+		HTTPTimeout:   time.Duration(getEnvInt("HTTP_TIMEOUT_MS", 60000)) * time.Millisecond,
+		LLMTimeout:    time.Duration(getEnvInt("LLM_TIMEOUT_MS", 120000)) * time.Millisecond,
+		ScrapeTimeout: time.Duration(getEnvInt("SCRAPE_TIMEOUT_MS", 25000)) * time.Millisecond,
+		SearchTimeout: time.Duration(getEnvInt("SEARCH_TIMEOUT_MS", 10000)) * time.Millisecond,
+
+		AllowedOrigins: parseOrigins(getEnv("ALLOWED_ORIGINS", "*")),
+	}
+
+	return cfg, nil
+}
+
+func Get() *Config {
+	if cfg == nil {
+		cfg, _ = Load()
+	}
+	return cfg
+}
+
+func getEnv(key, defaultValue string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return defaultValue
+}
+
+func getEnvInt(key string, defaultValue int) int {
+	if value := os.Getenv(key); value != "" {
+		if i, err := strconv.Atoi(value); err == nil {
+			return i
+		}
+	}
+	return defaultValue
+}
+
+func parseOrigins(s string) []string {
+	if s == "*" {
+		return []string{"*"}
+	}
+	origins := strings.Split(s, ",")
+	result := make([]string, 0, len(origins))
+	for _, o := range origins {
+		if trimmed := strings.TrimSpace(o); trimmed != "" {
+			result = append(result, trimmed)
+		}
+	}
+	return result
+}