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/.env.computer-svc

@@ -0,0 +1,65 @@
+# ============================================
+# GooSeek Computer Service — Environment
+# ============================================
+# Минимальный .env для запуска computer-svc
+# Копировать в .env и заполнить значения
+
+# ============================================
+# ОБЯЗАТЕЛЬНЫЕ
+# ============================================
+
+# PostgreSQL — хранение задач, памяти, артефактов
+DATABASE_URL=postgres://gooseek:password@postgres:5432/gooseek?sslmode=disable
+
+# Минимум один LLM провайдер
+OPENAI_API_KEY=sk-xxx
+
+# ============================================
+# РЕКОМЕНДУЕМЫЕ (multi-model routing)
+# ============================================
+
+# Claude — лучший для reasoning и coding
+ANTHROPIC_API_KEY=sk-ant-xxx
+
+# Gemini — лучший для long context и research
+GEMINI_API_KEY=xxx
+
+# Redis — кэширование
+REDIS_URL=redis://redis:6379
+
+# ============================================
+# ПОРТ СЕРВИСА
+# ============================================
+
+COMPUTER_SVC_PORT=3030
+
+# ============================================
+# SANDBOX (Docker для исполнения кода)
+# ============================================
+
+SANDBOX_IMAGE=gooseek/sandbox:latest
+
+# ============================================
+# CONNECTORS (опционально)
+# ============================================
+
+# --- Telegram Bot ---
+# Получить токен: @BotFather → /newbot
+TELEGRAM_BOT_TOKEN=
+
+# --- Email SMTP ---
+SMTP_HOST=
+SMTP_PORT=587
+SMTP_USERNAME=
+SMTP_PASSWORD=
+SMTP_FROM=
+SMTP_FROM_NAME=GooSeek Computer
+
+# --- S3/MinIO Storage ---
+S3_ENDPOINT=
+S3_ACCESS_KEY=
+S3_SECRET_KEY=
+S3_BUCKET=gooseek-artifacts
+S3_USE_SSL=false
+S3_REGION=us-east-1
+S3_PUBLIC_URL=