perf: 添加多层缓存优化减少数据库查询

- 新增 ProviderCacheService 缓存 Provider 和 ProviderAPIKey 数据
- SystemConfigService 添加进程内缓存（TTL 60秒）
- API Key last_used_at 更新添加节流策略（60秒间隔）
- HTTP 连接池配置改为可配置，支持根据 Worker 数量自动计算
- 前端优先级管理改用 health_score 显示健康度

src/api/admin/providers/routes.py

@@ -11,9 +11,11 @@ from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.pipeline import ApiRequestPipeline
 from src.core.enums import ProviderBillingType
 from src.core.exceptions import InvalidRequestException, NotFoundException
+from src.core.logger import logger
 from src.database import get_db
 from src.models.admin_requests import CreateProviderRequest, UpdateProviderRequest
 from src.models.database import Provider
+from src.services.cache.provider_cache import ProviderCacheService
 
 router = APIRouter(tags=["Provider CRUD"])
 pipeline = ApiRequestPipeline()
@@ -296,6 +298,11 @@ class AdminUpdateProviderAdapter(AdminApiAdapter):
             db.commit()
             db.refresh(provider)
 
+            # 如果更新了 billing_type，清除缓存
+            if "billing_type" in update_data:
+                await ProviderCacheService.invalidate_provider_cache(provider.id)
+                logger.debug(f"已清除 Provider 缓存: {provider.id}")
+
             context.add_audit_metadata(
                 action="update_provider",
                 provider_id=provider.id,