refactor: surface hydrogen source failures

src/server/routes/energy/index.ts

@@ -26,6 +26,26 @@ app.use('*', async (c, next) => {
   return next();
 });
 
+app.onError((error, c) => {
+  const sourceCode = typeof error === 'object' && error !== null && 'code' in error
+    ? String((error as { code?: unknown }).code ?? 'UNKNOWN')
+    : 'UNKNOWN';
+  if (c.req.path.includes('/hydrogen/')) {
+    console.error('[energy/hydrogen] data source unavailable', { code: sourceCode });
+    return c.json({
+      error: '当前无法读取氢能业务数据，请稍后重试',
+      code: 'HYDROGEN_SOURCE_UNAVAILABLE',
+      retryable: true,
+    }, 503);
+  }
+  console.error('[energy] request failed', { path: c.req.path, code: sourceCode });
+  return c.json({
+    error: '能源数据请求失败，请稍后重试',
+    code: 'ENERGY_REQUEST_FAILED',
+    retryable: true,
+  }, 500);
+});
+
 const HYDROGEN_MIN_DATE = '2024-01-01';
 
 // hydrogen_fuel_ledger.refuel_time 已是业务本地时间字面值，直接使用即可（不再 +8 小时）