feat(auth): add detailed logging in JwtAuthGuard and JwtStrategy for better debugging

feat(products): enhance logging in create method to track requests and user details

backend/src/auth/jwt-auth.guard.ts

@@ -10,11 +10,23 @@ export class JwtAuthGuard extends AuthGuard('jwt') {
   }
 
   canActivate(context: ExecutionContext) {
+    const request = context.switchToHttp().getRequest();
+    const authHeader = request.headers.authorization;
+    const path = request.path;
+    const method = request.method;
+    console.log(`[JwtAuthGuard.canActivate] ${method} ${path}`);
+    console.log(`[JwtAuthGuard.canActivate] Authorization header:`, authHeader ? 'YES' : 'NO');
+    
     const isPublic = this.reflector.getAllAndOverride<boolean>(IS_PUBLIC_KEY, [
       context.getHandler(),
       context.getClass(),
     ]);
+    console.log(`[JwtAuthGuard.canActivate] isPublic:`, isPublic);
+    
     if (isPublic) return true;
-    return super.canActivate(context);
+    
+    const result = super.canActivate(context);
+    console.log(`[JwtAuthGuard.canActivate] super.canActivate result:`, result);
+    return result;
   }
 }