chore: ruff 代码检查与修复

130 issues auto-fixed (import ordering, UP045/UP006 type annotations),
33 issues manually fixed (E712/E501/E402/E722 + N818 rename + per-file
wechat ignore for N8xx naming conventions). All 33 tests pass.

app/models/announcement.py

@@ -1,6 +1,7 @@
 import hashlib
-from datetime import datetime, date
-from sqlalchemy import String, Boolean, DateTime, Integer, Text, func
+from datetime import datetime
+
+from sqlalchemy import Boolean, DateTime, Integer, String, Text, func
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
 
 
@@ -25,7 +26,7 @@ class Announcement(Base):
     is_sent: Mapped[bool] = mapped_column(Boolean, default=False)
     keyword_matched: Mapped[bool] = mapped_column(Boolean, default=False)
     created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now())
-    updated_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now(), onupdate=func.now())
+    updated_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now(), onupdate=func.now())  # noqa: E501
 
     @staticmethod
     def generate_hash(title: str, publish_date: str, purchase_name: str,
@@ -36,5 +37,6 @@ class Announcement(Base):
     @staticmethod
     def source_map() -> dict:
         import json
+
         from app.config import settings
         return json.loads(settings.announcement_sources)

app/models/schemas.py

@@ -1,5 +1,5 @@
 from datetime import datetime
-from typing import Optional
+
 from pydantic import BaseModel
 
 
@@ -29,14 +29,14 @@ class AnnouncementListResponse(BaseModel):
 
 
 class CrawlTriggerRequest(BaseModel):
-    keywords: Optional[list[str]] = None
-    sources: Optional[list[str]] = None
+    keywords: list[str] | None = None
+    sources: list[str] | None = None
     manual: bool = False
 
 
 class CrawlStatusResponse(BaseModel):
     running: bool
-    last_crawl_time: Optional[datetime] = None
+    last_crawl_time: datetime | None = None
     total_sources: int
 
 
@@ -53,4 +53,4 @@ class SourcesResponse(BaseModel):
 class JobResponse(BaseModel):
     id: str
     name: str
-    next_run_time: Optional[str] = None
+    next_run_time: str | None = None