refactor(logging): centralize console output

src/app/auth/components/email-register-form.tsx

@@ -25,6 +25,9 @@ import { AuthTextField } from "./auth-text-field";
 import { AuthPrimaryButton } from "./auth-primary-button";
 import { AuthErrorMessage } from "./auth-error-message";
 import styles from "./email-form.module.css";
+import { Logger } from "@/utils";
+
+const log = new Logger("AppAuthComponentsEmailRegisterForm");
 
 export interface EmailRegisterFormProps {
   globalError?: string | null;
@@ -66,7 +69,7 @@ export function EmailRegisterForm({
   };
 
   const submit = () => {
-    console.log("[email-register-form] submit ENTRY", {
+    log.debug("[email-register-form] submit ENTRY", {
       emailLength: email.length,
       emailPreview: email.slice(0, 8),
       passwordLength: password.length,
@@ -81,7 +84,7 @@ export function EmailRegisterForm({
       // 按 username → email → password → confirm 顺序挑第一个错（与字段顺序一致）
       const firstErr =
         usernameErr ?? emailErr ?? passwordErr ?? confirmErr ?? null;
-      console.warn(
+      log.warn(
         "[email-register-form] submit VALIDATION FAILED (silent return)",
         {
           emailErr,
@@ -95,7 +98,7 @@ export function EmailRegisterForm({
       return;
     }
     setValidationError(null);
-    console.log(
+    log.debug(
       "[email-register-form] submit dispatching AuthEmailRegisterSubmitted",
     );
     dispatch({