feat(task-watcher): main.py + Dockerfile + requirements + env (SP-10)

FastAPI lifespan에서 watcher_loop 스폰. /health. tzdata(zoneinfo Asia/Seoul).
.env: REDIS_URL, STOCK_BASE_URL, TRADING_START/END.
Plan-B-Infra Phase 2.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

services/task-watcher/.env.example

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+# Plan-B-Infra — task-watcher
+
+# NAS Redis
+REDIS_URL=redis://192.168.45.54:6379
+
+# NAS stock holidays endpoint
+STOCK_BASE_URL=http://192.168.45.54:18500
+
+# 트레이딩 윈도우 (KST, HH:MM) — 이 시간대에만 queue:paused
+TRADING_START=07:00
+TRADING_END=16:30

services/task-watcher/Dockerfile

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+FROM python:3.12-slim-bookworm
+ENV PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates tzdata \
+ && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir --timeout 600 --retries 5 -r requirements.txt
+
+COPY . .
+
+EXPOSE 8000
+CMD ["python", "-m", "uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "1"]

services/task-watcher/main.py

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+"""task-watcher FastAPI entry — health + lifespan (watcher loop spawn)."""
+from __future__ import annotations
+
+import asyncio
+import logging
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+
+import watcher
+
+logging.basicConfig(level=logging.INFO, format="%(asctime)s %(name)s %(levelname)s %(message)s")
+logger = logging.getLogger(__name__)
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    watcher_task = asyncio.create_task(watcher.watcher_loop())
+    logger.info("task-watcher lifespan 시작")
+    try:
+        yield
+    finally:
+        watcher_task.cancel()
+        try:
+            await watcher_task
+        except asyncio.CancelledError:
+            pass
+        logger.info("task-watcher lifespan 종료")
+
+
+app = FastAPI(lifespan=lifespan)
+
+
+@app.get("/health")
+def health():
+    return {"ok": True, "service": "task-watcher"}

services/task-watcher/requirements.txt

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+fastapi==0.115.6
+uvicorn[standard]==0.34.0
+redis>=5.0
+httpx>=0.27
+pytest>=8.0