fix: 最新公告直接返回最新5条 + 显示来源网站 + 菜单调整

- latest_announcements 不再过滤 keyword_matched，返回全部最新5条
- 每条公告显示来源网站（广西政府采购网/大化县政府网采购公告）
- 菜单「今日公告」改为顶级按钮「最新公告」，移除子菜单重复项

app/wechat/handler.py

@@ -245,7 +245,6 @@ class WeChatMessageHandler:
             async for db in get_db():
                 stmt = (
                     select(Announcement)
-                    .where(Announcement.keyword_matched == True)  # noqa: E712
                     .order_by(desc(Announcement.publish_date))
                     .limit(5)
                 )
@@ -253,14 +252,16 @@ class WeChatMessageHandler:
                 items = result.scalars().all()
 
                 if not items:
-                    await self.client.send_text("暂无匹配关键词的公告", from_user)
+                    await self.client.send_text("暂无公告", from_user)
                     return None
 
-                lines = ["最新匹配公告（最近5条）:"]
+                lines = ["最新公告（最近5条）:"]
                 for i, ann in enumerate(items, 1):
-                    date_str = ann.publish_date.strftime("%m-%d") if ann.publish_date else "?"
-                    title = ann.title[:30] + "..." if len(ann.title) > 30 else ann.title
-                    lines.append(f"{i}. [{date_str}] {title}")
+                    date_str = ann.publish_date.strftime("%m-%d %H:%M") if ann.publish_date else "?"
+                    title = ann.title[:28] + "..." if len(ann.title) > 28 else ann.title
+                    source = ann.source_name or ann.source_code
+                    lines.append(f"{i}. [{date_str}] {source}")
+                    lines.append(f"   {title}")
                 await self.client.send_text("\n".join(lines), from_user)
         except Exception as e:
             logger.error(f"查询最新公告失败: {e}")

app/wechat/menu.py

@@ -9,9 +9,9 @@ logger = logging.getLogger(__name__)
 MENU = {
     "button": [
         {
-            "name": "今日公告",
+            "name": "最新公告",
             "type": "click",
-            "key": "today_stats",
+            "key": "latest_announcements",
         },
         {
             "name": "查询",
@@ -31,11 +31,6 @@ MENU = {
                     "type": "click",
                     "key": "workday_status",
                 },
-                {
-                    "name": "最新公告",
-                    "type": "click",
-                    "key": "latest_announcements",
-                },
             ],
         },
         {