refactor: replace all in-memory state with SQLite database

src/summarizer.py

@@ -58,14 +58,14 @@ def tg_send_and_mark(cfg: Config, info: dict):
     if thinking_msg_id:
         # 编辑思考中消息为实际摘要
         from src.tg_bot import _summary_keyboard
+        from src.database import save_email_context
         can_reply = info["data"].get("can_reply", True)
         is_promotion = info["data"].get("category") == "promotion"
         links = info["data"].get("links", [])
         edit_message(cfg.telegram, cfg.telegram.chat_id, thinking_msg_id,
                      info["text"], _summary_keyboard(can_reply, is_promotion, links))
         # 保存上下文用于回调
-        from src.tg_bot import _email_contexts
-        _email_contexts[thinking_msg_id] = {
+        save_email_context(thinking_msg_id, {
             "summary_text": info["text"],
             "summary_data": info["data"],
             "original_body": info["original_body"],
@@ -77,7 +77,7 @@ def tg_send_and_mark(cfg: Config, info: dict):
             "sender": info["data"].get("sender", ""),
             "subject": info["data"].get("subject", ""),
             "can_reply": can_reply,
-        }
+        })
     else:
         # 兜底：没有思考中消息就正常发送
         send_summary(cfg.telegram, cfg.telegram.chat_id,