Move 'Forgot Password' link below toggle button

Relocated the 'Forgot Password' link in the login form from above the submit button to below the account toggle button for improved UI consistency.

Author: Frederick-S

src/components/Auth.vue

@@ -77,18 +77,6 @@
                 class="mb-4"
               />
 
-              <!-- Forgot Password Link -->
-              <div v-if="isLogin" class="text-right mb-3">
-                <v-btn
-                  variant="text"
-                  color="primary"
-                  size="small"
-                  @click="showForgotPassword"
-                >
-                  忘记密码？
-                </v-btn>
-              </div>
-
               <v-btn
                 type="submit"
                 color="primary"
@@ -109,6 +97,17 @@
                   {{ isLogin ? '没有账户？注册' : '已有账户？登录' }}
                 </v-btn>
               </div>
+
+              <!-- Forgot Password Link (below toggle button) -->
+              <div v-if="isLogin" class="text-center mt-2">
+                <v-btn
+                  variant="text"
+                  color="primary"
+                  @click="showForgotPassword"
+                >
+                  忘记密码？
+                </v-btn>
+              </div>
             </v-form>
 
             <v-alert