fix: PDF extraction bbox compatibility, update date formats, and bump max retries

- Fix bbox format detection in pdf_image_extractor (support Rect and tuple)
- Update date display format to include year (%Y-%m-%d) across templates
- Increase SUMMARY_MAX_RETRIES from 1 to 2 for better error recovery
- Widen date input field for better usability

app/config.py

@@ -33,7 +33,7 @@ class Settings(BaseSettings):
     SUMMARY_SKILL: str = "daily-paper-summary"
     SUMMARY_CONCURRENCY: int = 3
     SUMMARY_TIMEOUT_SECONDS: int = 900
-    SUMMARY_MAX_RETRIES: int = 1
+    SUMMARY_MAX_RETRIES: int = 2
     SUMMARY_PDF_MODE: str = "auto"  # "auto" = ≤80k 用 inject，>80k 用 search；也可强制 "inject" / "search"
 
     # 调度