fix(figures): PMC 解析冷连接重试——176 实测首次 TLS 握手 10s+ 超时,重连秒回;失败重试一次走热路径

sdk/app/services/figures.py

@@ -160,7 +160,7 @@ def _job_pmcid(job_dir: Path, pmcid_to_paper: dict[str, str]) -> str | None:
 # PMC 外网解析
 # ---------------------------------------------------------------------------
 
-async def _epmc_figures(client: httpx.AsyncClient, pmcid: str) -> tuple[list[dict], str]:
+async def _epmc_figures_once(client: httpx.AsyncClient, pmcid: str) -> tuple[list[dict], str]:
     """返回 (figures, license)。任何失败返回 ([], "")。"""
     try:
         r = await client.get(EPMC_FULLTEXT.format(pmcid=pmcid), timeout=EXTERNAL_TIMEOUT)
@@ -227,6 +227,17 @@ async def _epmc_figures(client: httpx.AsyncClient, pmcid: str) -> tuple[list[dic
         return [], ""
 
 
+async def _epmc_figures(client: httpx.AsyncClient, pmcid: str) -> tuple[list[dict], str]:
+    """PMC 解析重试包装：2026-09-12 部署质检发现 176 出网到 EBI 冷连接
+    首次 TLS 握手 10s+ 超时、重连即秒回（实测 1.6-2.2s），失败重试一次。"""
+    for attempt in (1, 2):
+        figs, license_ = await _epmc_figures_once(client, pmcid)
+        if figs or attempt == 2:
+            return figs, license_
+        logger.info("PMC 首次解析失败（%s）——重试一次（176 冷连接实测）", pmcid)
+    return [], ""
+
+
 # ---------------------------------------------------------------------------
 # 对外 API
 # ---------------------------------------------------------------------------