feat(channels): 增强负载均衡和重试逻辑

src/admin/channel_api.ts

@@ -190,8 +190,8 @@ export class ChannelUpsertEndpoint extends OpenAPIRoute {
                             weight: z.number().int().min(0).max(5).optional().describe('Priority weight for channel routing'),
                             api_key: z.string().optional().describe('Deprecated single API key'),
                             api_keys: z.array(z.string()).optional().describe('API keys, one request will pick one randomly'),
-                            auto_retry: z.boolean().optional().describe('Automatically retry the same API key'),
-                            auto_rotate: z.boolean().optional().describe('Automatically rotate to other API keys on retryable failures'),
+                            auto_retry: z.boolean().optional().describe('Automatically retry the channel up to 3 times on retryable failures'),
+                            auto_rotate: z.boolean().optional().describe('When retrying, randomly rotate to other API keys in the same channel'),
                             models: z.array(ChannelModelSchema).optional().describe('External model name to upstream model ID mappings'),
                             supported_models: z.array(z.string()).optional().describe('Deprecated supported request model list'),
                             deployment_mapper: z.record(z.string(), z.string()).optional().describe('Deprecated model deployment mapping'),