feat(nofxi): Phase 3 complete - Exchange factory, Web UI, Strategy runner, Docker

Exchange Factory:
- CreateTrader() supports Binance/OKX/Bybit/Bitget/KuCoin/Gate
- Auto-registers traders from config on startup
- Direct import of nofx/trader packages (merged into main module)

Web UI:
- Dark theme chat interface at :8900
- Quick action sidebar (analyze, watch, positions, balance)
- Real-time health check indicator
- Mobile responsive

Strategy Runner:
- /strategy start BTC 1h - AI auto-analyzes on interval
- /strategy stop <id> - stop strategy
- /strategy list - view active strategies
- Notifications pushed to Telegram on signals
- Configurable intervals: 15m/30m/1h/4h

Docker:
- Multi-stage Dockerfile (alpine, ~20MB)
- docker-compose.yml with volume persistence

Bug fixes:
- Fixed panic on empty exchanges config
- Fixed thinking mode response parsing (qwen3 content:null)
- Added request timeout (55s) in Telegram handler
- Better error logging

nofxi/docker-compose.yml

@@ -0,0 +1,23 @@
+version: '3.8'
+
+services:
+  nofxi:
+    build:
+      context: ..
+      dockerfile: nofxi/Dockerfile
+    container_name: nofxi
+    restart: unless-stopped
+    ports:
+      - "8900:8900"
+    volumes:
+      - ./config.yaml:/app/config.yaml:ro
+      - nofxi-data:/app/data
+    environment:
+      - TZ=Asia/Shanghai
+      # Override config via env vars:
+      # - NOFXI_TELEGRAM_TOKEN=xxx
+      # - NOFXI_LLM_API_KEY=xxx
+      # - NOFXI_LLM_BASE_URL=xxx
+
+volumes:
+  nofxi-data: