chore: 集成 LLM 增强 — config/main/articles schema/workers + .env.example 加 Agnes 配置

backend/app/workers/__main__.py

@@ -17,6 +17,7 @@ from sqlalchemy import select
 from app.config import settings
 from app.database import AsyncSessionLocal
 from app.models.source import Source
+from app.services.llm.enrichment import enrichment_loop
 from app.workers.pipeline import fetch_one_source, run_once, translation_loop
 
 logger = logging.getLogger("news.worker")
@@ -93,6 +94,10 @@ async def main() -> None:
     translation_task = asyncio.create_task(translation_loop(), name="translation_loop")
     logger.info("translation_loop task scheduled (1 article/sec)")
 
+    # 独立的 LLM 增强后台循环(翻译完成后,跑 4 项 LLM 任务)
+    enrichment_task = asyncio.create_task(enrichment_loop(), name="enrichment_loop")
+    logger.info("enrichment_loop task scheduled (scans translated articles)")
+
     stop = asyncio.Event()
 
     def _signal_handler():
@@ -108,12 +113,13 @@ async def main() -> None:
             pass
 
     await stop.wait()
-    logger.info("stopping scheduler and translation loop")
-    translation_task.cancel()
-    try:
-        await translation_task
-    except asyncio.CancelledError:
-        pass
+    logger.info("stopping scheduler and background loops")
+    for t in (translation_task, enrichment_task):
+        t.cancel()
+        try:
+            await t
+        except asyncio.CancelledError:
+            pass
     scheduler.shutdown(wait=False)