fix: add missing issuer-service JwtStrategy + fix home search bar overflow

- Add issuer-service/infrastructure/strategies/jwt.strategy.ts (was omitted
  from previous commit, causing build failure)
- Wrap search hint Text in Expanded to prevent Row overflow

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/services/issuer-service/src/infrastructure/strategies/jwt.strategy.ts

@@ -0,0 +1,18 @@
+import { Injectable } from '@nestjs/common';
+import { PassportStrategy } from '@nestjs/passport';
+import { ExtractJwt, Strategy } from 'passport-jwt';
+
+@Injectable()
+export class JwtStrategy extends PassportStrategy(Strategy, 'jwt') {
+  constructor() {
+    super({
+      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
+      ignoreExpiration: false,
+      secretOrKey: process.env.JWT_ACCESS_SECRET || 'dev-access-secret',
+    });
+  }
+
+  async validate(payload: { sub: string; role: string; kycLevel: number; type: string }) {
+    return { sub: payload.sub, role: payload.role, kycLevel: payload.kycLevel };
+  }
+}

frontend/genex-mobile/lib/features/coupons/presentation/pages/home_page.dart

@@ -247,9 +247,12 @@ class _HomePageState extends State<HomePage> {
             const SizedBox(width: 14),
             const Icon(Icons.search_rounded, size: 20, color: AppColors.textTertiary),
             const SizedBox(width: 8),
-            Text(
+            Expanded(
+              child: Text(
                 context.t('home.searchHint'),
                 style: AppTypography.bodyMedium.copyWith(color: AppColors.textTertiary),
+                overflow: TextOverflow.ellipsis,
+              ),
             ),
           ],
         ),