微信小程序支付遇到问题，因为没有 WX_MCH_PRIVATE_KEY

server/dukang-api/src/common/system-config/system-config.env.ts

@@ -1,7 +1,10 @@
 import { resolve } from 'path';
 import { PrismaClient } from '@prisma/client';
+import { normalizePemEnv } from '../../integrations/wechat/wechat-pay.util';
 import { SYSTEM_CONFIG_KEY_SET } from './system-config.registry';
 
+const PEM_ENV_KEYS = new Set(['WX_MCH_PRIVATE_KEY', 'WX_PLATFORM_CERT']);
+
 function apiRoot() {
   return resolve(__dirname, '..', '..');
 }
@@ -11,6 +14,11 @@ export function resolveEnvFilePath() {
   return resolve(apiRoot(), isProduction ? '.env.production' : '.env');
 }
 
+function normalizeConfigValue(key: string, value: string): string {
+  if (PEM_ENV_KEYS.has(key)) return normalizePemEnv(value);
+  return value;
+}
+
 /** 启动前从 DB 覆盖 process.env（在 Nest 创建前调用） */
 export async function preloadSystemConfigEnv(): Promise<number> {
   const prisma = new PrismaClient();
@@ -18,7 +26,7 @@ export async function preloadSystemConfigEnv(): Promise<number> {
     const rows = await prisma.systemConfig.findMany();
     for (const row of rows) {
       if (SYSTEM_CONFIG_KEY_SET.has(row.configKey)) {
-        process.env[row.configKey] = row.value;
+        process.env[row.configKey] = normalizeConfigValue(row.configKey, row.value);
       }
     }
     return rows.length;
@@ -41,7 +49,7 @@ export async function preloadSystemConfigEnv(): Promise<number> {
 export function applyEnvOverlay(values: Record<string, string>) {
   for (const [key, value] of Object.entries(values)) {
     if (SYSTEM_CONFIG_KEY_SET.has(key)) {
-      process.env[key] = value;
+      process.env[key] = normalizeConfigValue(key, value);
     }
   }
 }