feat(wx-finance): 会话存档轮询间隔 3s→0.5s(支持亚秒, int→float)

mentor 要求把会话存档轮询从 3s 提到 0.5s。WX_FINANCE_POLL_INTERVAL_SEC 由 int 改 float
(默认 0.5), poller 的可打断 sleep 从 range(int) 改为按 ≤0.5s 分片的 while 循环(原 range()
不吃 float、无法支持亚秒间隔), 启动日志 %d→%s。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/core/config.py

@@ -165,7 +165,7 @@ class Settings(BaseSettings):
     WX_FINANCE_SECRET: str = ""                # 会话存档【专用】Secret(≠微信客服/自建应用)
     WX_FINANCE_SDK_PATH: str = "./libWeWorkFinanceSdk_C.so"                 # WeWorkFinanceSdk C 库(Linux .so)
     WX_FINANCE_PRIVATE_KEY_PATH: str = "./secrets/wx_finance_private.pem"   # RSA 私钥(解 encrypt_random_key)
-    WX_FINANCE_POLL_INTERVAL_SEC: int = 3      # GetChatData 轮询间隔(无回调, 自己定频)
+    WX_FINANCE_POLL_INTERVAL_SEC: float = 0.5  # GetChatData 轮询间隔秒(无回调、自己定频;支持亚秒如 0.5)
     WX_FINANCE_SEQ_FILE: str = "./data/wx_finance_seq.txt"                  # seq 游标持久化(防丢/重复)
     WX_FINANCE_RECEIVER_USERID: str = ""       # 接收成员 userid(万朗杰);只处理【非他发】的消息, 空=不过滤
     WX_FINANCE_INTERNAL_URL: str = "http://127.0.0.1:8770"   # poller 通知 app-server 打信号的内部地址(同机)

scripts/wx_finance_poller.py

@@ -94,7 +94,7 @@ def main() -> None:
     )
     seq = _load_seq()
     logger.info(
-        "wx_finance poller 启动, 从 seq=%d 轮询, 间隔 %ds", seq, settings.WX_FINANCE_POLL_INTERVAL_SEC
+        "wx_finance poller 启动, 从 seq=%d 轮询, 间隔 %ss", seq, settings.WX_FINANCE_POLL_INTERVAL_SEC
     )
     with httpx.Client() as client:
         while not _stop:
@@ -115,11 +115,13 @@ def main() -> None:
                 logger.exception("GetChatData 出错")
             except Exception:
                 logger.exception("轮询异常")
-            # 可打断的 sleep(收到 SIGTERM 尽快退)
-            for _ in range(max(1, settings.WX_FINANCE_POLL_INTERVAL_SEC) * 2):
-                if _stop:
-                    break
-                time.sleep(0.5)
+            # 可打断的 sleep:按 ≤0.5s 分片, 支持亚秒间隔(如 0.5s), 收到 SIGTERM 尽快退
+            interval = max(0.1, settings.WX_FINANCE_POLL_INTERVAL_SEC)
+            step = min(0.5, interval)
+            slept = 0.0
+            while slept < interval and not _stop:
+                time.sleep(step)
+                slept += step
     sdk.close()
     logger.info("wx_finance poller 已停止")