fix(auth): align frontend password validation with production policy

backend/src/auth/adminRoutes.ts

@@ -397,6 +397,16 @@ export const registerAdminRoutes = (deps: RegisterAdminRoutesDeps) => {
 
       const parsed = adminCreateUserSchema.safeParse(req.body);
       if (!parsed.success) {
+        const summarizedIssues = parsed.error.issues.map((issue) => ({
+          code: issue.code,
+          path: issue.path.join("."),
+          message: issue.message,
+        }));
+        console.warn("[auth/users] validation failed", {
+          issues: summarizedIssues,
+          requestId: req.headers["x-request-id"],
+          ip: req.ip || req.connection.remoteAddress || "unknown",
+        });
         return res.status(400).json({
           error: "Validation error",
           message: "Invalid user payload",