fix: restore coding history and quota feedback

electron/coding-runtime/pi/provider-failure.ts

@@ -0,0 +1,25 @@
+import type { CodingRuntimePublicError } from '../contracts';
+import { isAIGatewayUserContextMissing } from '../../../shared/ai-gateway-error-details';
+import { getAIGatewayErrorKind } from '../../../shared/ai-gateway-error-kind';
+
+export function projectPiProviderFailure(message: unknown): CodingRuntimePublicError {
+  if (typeof message === 'string' && isAIGatewayUserContextMissing(message)) {
+    return {
+      code: 'CODING_PROVIDER_AUTH_REQUIRED',
+      message: '模型服务身份上下文无效，请重试；若仍失败请重新登录。',
+      recoverable: true,
+    };
+  }
+  if (typeof message === 'string' && getAIGatewayErrorKind(message) === 'quota_exhausted') {
+    return {
+      code: 'CODING_PROVIDER_QUOTA_EXHAUSTED',
+      message: '词元点数余额不足，请充值后重试。',
+      recoverable: false,
+    };
+  }
+  return {
+    code: 'CODING_RUNTIME_START_FAILED',
+    message: '模型服务请求失败，请稍后重试。',
+    recoverable: true,
+  };
+}