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/internal/agent/router.go

@@ -24,6 +24,7 @@ const (
 	IntentHelp                          // Help / command list
 	IntentStatus                        // Check agent/system status
 	IntentWatch                         // Watch symbols, price alerts
+	IntentStrategy                      // Start/stop/list strategies
 )
 
 var (
@@ -134,6 +135,8 @@ func routeCommand(text string) Intent {
 		return Intent{Type: IntentQuery, Raw: text}
 	case "/watch", "/unwatch", "/alert", "/price":
 		return Intent{Type: IntentWatch, Raw: text}
+	case "/strategy":
+		return Intent{Type: IntentStrategy, Raw: text}
 	case "/analyze":
 		parts := strings.SplitN(text, " ", 2)
 		detail := ""