bugfix: .env.example files updated. some minor changes in jwt strategy to avoid failing when .env files does not contain needed keys.

backend/src/modules/auth/strategies/jwt.strategy.ts

@@ -17,7 +17,7 @@ export class JwtStrategy extends PassportStrategy(Strategy) {
     return req?.cookies?.accessToken; // ✅ READ FROM COOKIE
   },
   ignoreExpiration: false,
-  secretOrKey: configService.get('JWT_SECRET'),
+  secretOrKey: configService.get<string>('jwt.secret'),
     });
   }