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/Dockerfile

@@ -0,0 +1,31 @@
+# Build stage
+FROM golang:1.25-alpine AS builder
+
+RUN apk add --no-cache git
+
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /nofxi ./nofxi/cmd/nofxi/
+
+# Runtime stage
+FROM alpine:3.19
+
+RUN apk add --no-cache ca-certificates tzdata
+
+WORKDIR /app
+
+COPY --from=builder /nofxi .
+COPY nofxi/config.example.yaml ./config.example.yaml
+
+# Create data directory for SQLite
+RUN mkdir -p /app/data
+
+ENV TZ=Asia/Shanghai
+
+EXPOSE 8900
+
+ENTRYPOINT ["./nofxi"]
+CMD ["--config", "/app/config.yaml"]