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/endpoints/keys.py

@@ -18,6 +18,7 @@ from src.core.key_capabilities import get_capability
 from src.core.logger import logger
 from src.database import get_db
 from src.models.database import Provider, ProviderAPIKey, ProviderEndpoint
+from src.services.cache.provider_cache import ProviderCacheService
 from src.models.endpoint_models import (
     BatchUpdateKeyPriorityRequest,
     EndpointAPIKeyCreate,
@@ -411,6 +412,10 @@ class AdminUpdateEndpointKeyAdapter(AdminApiAdapter):
         db.commit()
         db.refresh(key)
 
+        # 如果更新了 rate_multiplier，清除缓存
+        if "rate_multiplier" in update_data:
+            await ProviderCacheService.invalidate_provider_api_key_cache(self.key_id)
+
         logger.info("[OK] 更新 Key: ID=%s, Updates=%s", self.key_id, list(update_data.keys()))
 
         try:
@@ -550,6 +555,7 @@ class AdminGetKeysGroupedByFormatAdapter(AdminApiAdapter):
                     "endpoint_base_url": endpoint.base_url,
                     "api_format": api_format,
                     "capabilities": caps_list,
+                    "health_score": key.health_score,
                     "success_rate": success_rate,
                     "avg_response_time_ms": avg_response_time_ms,
                     "request_count": key.request_count,

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,