feat: 平台治理与权限体系完善，存储进度/GPU预留/审批中心与日志整合

- 平台治理: 租户用户权限层次、资源ACL、审批中心与审批模板、访问申请
- 存储: MinIO 存储进度迁移、对象存储安全加固与测试
- 计算: GPU 资源预留、compute 轮询与同步增强
- 权限: permission v2 迁移、权限安全验收测试
- 日志: 后端运行日志中文说明、操作日志整合
- 数据处理/评测: 数据转换与模型评测优化

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

backend/app/workers/compute_poller.py

@@ -1,9 +1,11 @@
 from __future__ import annotations
 
 import asyncio
+import time
 
 from app.core.config import get_settings
 from app.core.logging import get_logger
+from app.db.platform_store import get_platform_store
 from app.modules.compute_gateway.sync import poll_compute_jobs_once
 
 
@@ -18,11 +20,33 @@ async def run_compute_poller() -> None:
 
     interval = max(3, settings.compute_poll_interval_seconds)
     logger.info("compute poller started", extra={"interval_seconds": interval})
+    # PlatformStore may run additive schema checks against a remote PostgreSQL
+    # server on first use. Keep that startup work off the Uvicorn event loop so
+    # health checks and normal API requests can still respond while the DB is
+    # unavailable or slow.
+    store = None
+    last_failure_signature = ""
+    last_failure_logged_at = 0.0
+    await asyncio.sleep(1)
     while True:
         try:
-            result = await poll_compute_jobs_once()
+            if store is None:
+                store = await asyncio.to_thread(get_platform_store)
+            result = await poll_compute_jobs_once(store)
             if result["failed"]:
-                logger.warning("compute polling reported failures", extra={"result": result})
+                signature = "|".join(sorted({
+                    str(item.get("error") or "")[:120]
+                    for item in result["failed"]
+                }))
+                now = time.monotonic()
+                if signature != last_failure_signature or now - last_failure_logged_at >= 300:
+                    logger.warning(
+                        "compute polling reported failures count=%d first_error=%s",
+                        len(result["failed"]),
+                        signature[:500],
+                    )
+                    last_failure_signature = signature
+                    last_failure_logged_at = now
             elif result["synced"]:
                 logger.debug("compute jobs synchronized", extra={"result": result})
         except asyncio.CancelledError:
@@ -30,4 +54,6 @@ async def run_compute_poller() -> None:
             raise
         except Exception as exc:  # noqa: BLE001 - keep background polling alive
             logger.exception("compute poller failed", extra={"error": str(exc)})
+            if "store" in locals() and isinstance(exc, (ConnectionError, TimeoutError)):
+                store = None
         await asyncio.sleep(interval)