feat: 帮助图片点击放大（lightbox）

点击支付页右侧帮助区域的联系二维码图片，在屏幕正中以全屏遮罩放大展示；
点击背景或再次点击可关闭。

docker-compose.app.yml

@@ -12,4 +12,7 @@ services:
     ports:
       - '${APP_PORT:-3001}:3000'
     env_file: .env
+    volumes:
+      # 宿主机 uploads 目录挂载到 Next.js public/uploads，可通过 /uploads/* 访问
+      - ./uploads:/app/public/uploads:ro
     restart: unless-stopped

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() {
@@ -60,12 +62,13 @@ function PayContent() {
     maxDailyAmount: 0,
   });
   const [userNotFound, setUserNotFound] = useState(false);
+  const [helpImageOpen, setHelpImageOpen] = useState(false);
 
   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 helpImageUrl = (config.helpImageUrl || '').trim();
-  const helpText = (process.env.NEXT_PUBLIC_PAY_HELP_TEXT || '').trim();
+  const helpText = (config.helpText || '').trim();
   const hasHelpContent = Boolean(helpImageUrl || helpText);
 
   useEffect(() => {
@@ -100,6 +103,8 @@ 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) {
@@ -428,7 +433,8 @@ function PayContent() {
                       <img
                         src={helpImageUrl}
                         alt='help'
-                        className='mt-3 max-h-40 w-full rounded-lg object-contain bg-white/70 p-2'
+                        onClick={() => setHelpImageOpen(true)}
+                        className='mt-3 max-h-40 w-full cursor-zoom-in rounded-lg object-contain bg-white/70 p-2'
                       />
                     )}
                     {helpText && (
@@ -463,6 +469,20 @@ function PayContent() {
       {step === 'result' && (
         <OrderStatus status={finalStatus} onBack={handleBack} dark={isDark} />
       )}
+
+      {helpImageOpen && helpImageUrl && (
+        <div
+          className="fixed inset-0 z-50 flex items-center justify-center bg-black/75 p-4 backdrop-blur-sm"
+          onClick={() => setHelpImageOpen(false)}
+        >
+          <img
+            src={helpImageUrl}
+            alt='help'
+            className='max-h-[90vh] max-w-full rounded-xl object-contain shadow-2xl'
+            onClick={(e) => e.stopPropagation()}
+          />
+        </div>
+      )}
     </PayPageLayout>
   );
 }

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,
+  PAY_HELP_IMAGE_URL: optionalTrimmedString,
-  NEXT_PUBLIC_PAY_HELP_TEXT: optionalTrimmedString,
+  PAY_HELP_TEXT: optionalTrimmedString,
 });
 
 export type Env = z.infer<typeof envSchema>;