fix: 帮助内容改为服务端变量经 API 下发，运行时可配无需重新构建

src/app/api/user/route.ts

@@ -27,6 +27,8 @@ export async function GET(request: NextRequest) {
         maxAmount: env.MAX_RECHARGE_AMOUNT,
         maxDailyAmount: env.MAX_DAILY_RECHARGE_AMOUNT,
         methodLimits,
+        helpImageUrl: env.PAY_HELP_IMAGE_URL ?? null,
+        helpText: env.PAY_HELP_TEXT ?? null,
       },
     });
   } catch (error) {

src/app/pay/page.tsx

@@ -27,6 +27,8 @@ interface AppConfig {
   maxAmount: number;
   maxDailyAmount: number;
   methodLimits?: Record<string, MethodLimitInfo>;
+  helpImageUrl?: string | null;
+  helpText?: string | null;
 }
 
 function PayContent() {
@@ -64,8 +66,8 @@ function PayContent() {
   const effectiveUserId = resolvedUserId || userId;
   const isEmbedded = uiMode === 'embedded' && isIframeContext;
   const hasToken = token.length > 0;
-  const helpImageUrl = (process.env.NEXT_PUBLIC_PAY_HELP_IMAGE_URL || '').trim();
-  const helpText = (process.env.NEXT_PUBLIC_PAY_HELP_TEXT || '').trim();
+  const helpImageUrl = (config.helpImageUrl || '').trim();
+  const helpText = (config.helpText || '').trim();
   const hasHelpContent = Boolean(helpImageUrl || helpText);
 
   useEffect(() => {
@@ -100,6 +102,8 @@ function PayContent() {
             maxAmount: cfgData.config.maxAmount ?? 1000,
             maxDailyAmount: cfgData.config.maxDailyAmount ?? 0,
             methodLimits: cfgData.config.methodLimits,
+            helpImageUrl: cfgData.config.helpImageUrl ?? null,
+            helpText: cfgData.config.helpText ?? null,
           });
         }
       } else if (cfgRes.status === 404) {

src/lib/config.ts

@@ -56,8 +56,8 @@ const envSchema = z.object({
   ADMIN_TOKEN: z.string().min(1),
 
   NEXT_PUBLIC_APP_URL: z.string().url(),
-  NEXT_PUBLIC_PAY_HELP_IMAGE_URL: optionalTrimmedString,
-  NEXT_PUBLIC_PAY_HELP_TEXT: optionalTrimmedString,
+  PAY_HELP_IMAGE_URL: optionalTrimmedString,
+  PAY_HELP_TEXT: optionalTrimmedString,
 });
 
 export type Env = z.infer<typeof envSchema>;