feat: add claude backend, refactor summary utilities, improve batch worker pattern, add pymupdf4llm

app/cli.py

@@ -1,6 +1,7 @@
 """CLI 工具 — 手动抓取论文。"""
 
 import asyncio
+import logging
 
 import typer
 from dotenv import load_dotenv
@@ -49,8 +50,11 @@ def crawl(
         typer.echo(f"📡 开始抓取 {target} ...")
         result = asyncio.run(crawl_daily(db, target, top_n))
 
-        # 未指定日期且今天无数据时，自动回退到昨天
-        if not date_str and result["status"] == "success" and result["found"] == 0:
+        # 未指定日期且今天失败或无数据时，自动回退到昨天
+        need_fallback = not date_str and (
+            result["status"] == "failed" or result["found"] == 0
+        )
+        if need_fallback:
             fallback = yesterday_str()
             existing = db.scalar(select(func.count(Paper.id)).where(Paper.paper_date == fallback)) or 0
             if existing > 0:
@@ -84,6 +88,11 @@ def summarize(
         "--pdf-mode",
         help="PDF 传递方式：auto（自动选择）| inject（全量注入）| search（pi 自主搜索）",
     ),
+    backend: str = typer.Option(
+        None,
+        "--backend",
+        help="总结后端：pi | claude（留空则使用 .env 配置）",
+    ),
 ):
     """手动触发 AI 总结。"""
     from app.config import settings
@@ -97,9 +106,22 @@ def summarize(
         typer.echo(f"❌ 无效的 pdf_mode: {pdf_mode}，只支持 auto / inject / search", err=True)
         raise typer.Exit(code=1)
 
+    if backend:
+        if backend not in ("pi", "claude"):
+            typer.echo(f"❌ 无效的 backend: {backend}，只支持 pi / claude", err=True)
+            raise typer.Exit(code=1)
+        settings.SUMMARY_BACKEND = backend
+
     os.makedirs(settings.db_path.parent, exist_ok=True)
     _init(engine)
 
+    # 配置 logging 输出到终端
+    logging.basicConfig(
+        level=logging.INFO,
+        format="%(asctime)s %(levelname)-5s %(name)s | %(message)s",
+        datefmt="%H:%M:%S",
+    )
+
     db = SessionLocal()
     try:
         if arxiv_id: