feat(video-render): worker.py — Redis BLPOP + 4 job_type dispatch (SP-7)

queue:video-render BLPOP, queue:paused 체크 후 dispatch.
string-based _DISPATCH_TABLE + getattr (테스트 patch 호환, Plan-B-Music 패턴).
AttributeError 가드 포함. asyncio.to_thread로 sync provider wrap.
4 job_type: sora/veo/kling/seedance _generation.
Plan-B-Video Phase 2.

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

services/video-render/worker.py

@@ -0,0 +1,80 @@
+"""Redis BLPOP worker — queue:video-render → job_type 디스패치 → NAS webhook.
+
+queue:paused 가 set이면 대기 (task-watcher가 박재오 활동 감지 시 set).
+Plan-B-Music worker.py 패턴 — string-based dispatch + getattr (테스트 patch 호환).
+"""
+from __future__ import annotations
+
+import asyncio
+import json
+import logging
+import os
+import sys
+
+import redis.asyncio as aioredis
+
+from nas_client import webhook_update_task
+from providers.sora import run_sora_generation
+from providers.veo import run_veo_generation
+from providers.kling import run_kling_generation
+from providers.seedance import run_seedance_generation
+
+logger = logging.getLogger(__name__)
+
+REDIS_URL = os.getenv("REDIS_URL", "redis://192.168.45.54:6379")
+QUEUE_KEY = "queue:video-render"
+PAUSED_KEY = "queue:paused"
+
+# string names so `unittest.mock.patch` on `worker.<name>` is correctly intercepted
+_DISPATCH_TABLE = {
+    "sora_generation":     "run_sora_generation",
+    "veo_generation":      "run_veo_generation",
+    "kling_generation":    "run_kling_generation",
+    "seedance_generation": "run_seedance_generation",
+}
+
+
+def _dispatch(payload: dict) -> None:
+    """payload[job_type] → provider 함수 호출 (sync, worker_loop에서 asyncio.to_thread로 wrap)."""
+    job_type = payload.get("job_type", "")
+    task_id = payload.get("task_id", "")
+    params = payload.get("params", {})
+    fn_name = _DISPATCH_TABLE.get(job_type)
+    if fn_name is None:
+        logger.error("unknown job_type=%s task=%s", job_type, task_id)
+        webhook_update_task(task_id, "failed", 0, "", error=f"unknown job_type: {job_type}")
+        return
+    try:
+        fn = getattr(sys.modules[__name__], fn_name)
+    except AttributeError:
+        logger.error("dispatch table typo for job_type=%s name=%s task=%s", job_type, fn_name, task_id)
+        webhook_update_task(task_id, "failed", 0, "", error=f"internal dispatch error: {fn_name}")
+        return
+    fn(task_id, params)
+
+
+async def worker_loop():
+    redis = aioredis.from_url(REDIS_URL, decode_responses=False)
+    logger.info("video-render worker started (queue=%s)", QUEUE_KEY)
+    while True:
+        try:
+            paused = await redis.get(PAUSED_KEY)
+            if paused == b"1":
+                await asyncio.sleep(10)
+                continue
+            item = await redis.blpop(QUEUE_KEY, timeout=1)
+            if item is None:
+                continue
+            _, raw = item
+            try:
+                payload = json.loads(raw)
+            except json.JSONDecodeError:
+                logger.error("invalid queue payload: %r", raw[:200])
+                continue
+            await asyncio.to_thread(_dispatch, payload)
+        except asyncio.CancelledError:
+            logger.info("worker_loop cancelled")
+            raise
+        except Exception:
+            logger.exception("worker_loop iteration 실패, 5초 후 재시도")
+            await asyncio.sleep(5)