Merge upstream/main: v0.1.61 updates with TOTP & password reset

Major features:
- feat(auth): add TOTP (2FA) support for enhanced security
- feat(auth): add password reset functionality
- feat(openai): improve rate limit handling with reset time tracking
- feat(subscription): add expiry notification service
- fix(urlvalidator): remove trailing slash from validated URLs
- docs: update demo site domain

Resolved conflicts:
- deploy/docker-compose.yml: added TOTP_ENCRYPTION_KEY config
- setting_service.go: keep TianShuAPI site name while adding new features

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

frontend/src/views/admin/SettingsView.vue

@@ -338,6 +338,47 @@
               </div>
               <Toggle v-model="form.promo_code_enabled" />
             </div>
+
+            <!-- Password Reset - Only show when email verification is enabled -->
+            <div
+              v-if="form.email_verify_enabled"
+              class="flex items-center justify-between border-t border-gray-100 pt-4 dark:border-dark-700"
+            >
+              <div>
+                <label class="font-medium text-gray-900 dark:text-white">{{
+                  t('admin.settings.registration.passwordReset')
+                }}</label>
+                <p class="text-sm text-gray-500 dark:text-gray-400">
+                  {{ t('admin.settings.registration.passwordResetHint') }}
+                </p>
+              </div>
+              <Toggle v-model="form.password_reset_enabled" />
+            </div>
+
+            <!-- TOTP 2FA -->
+            <div
+              class="flex items-center justify-between border-t border-gray-100 pt-4 dark:border-dark-700"
+            >
+              <div>
+                <label class="font-medium text-gray-900 dark:text-white">{{
+                  t('admin.settings.registration.totp')
+                }}</label>
+                <p class="text-sm text-gray-500 dark:text-gray-400">
+                  {{ t('admin.settings.registration.totpHint') }}
+                </p>
+                <!-- Warning when encryption key not configured -->
+                <p
+                  v-if="!form.totp_encryption_key_configured"
+                  class="mt-2 text-sm text-amber-600 dark:text-amber-400"
+                >
+                  {{ t('admin.settings.registration.totpKeyNotConfigured') }}
+                </p>
+              </div>
+              <Toggle
+                v-model="form.totp_enabled"
+                :disabled="!form.totp_encryption_key_configured"
+              />
+            </div>
           </div>
         </div>
 
@@ -1029,6 +1070,9 @@ const form = reactive<SettingsForm>({
   registration_enabled: true,
   email_verify_enabled: false,
   promo_code_enabled: true,
+  password_reset_enabled: false,
+  totp_enabled: false,
+  totp_encryption_key_configured: false,
   default_balance: 0,
   default_concurrency: 1,
   site_name: 'TianShuAPI',
@@ -1152,6 +1196,8 @@ async function saveSettings() {
       registration_enabled: form.registration_enabled,
       email_verify_enabled: form.email_verify_enabled,
       promo_code_enabled: form.promo_code_enabled,
+      password_reset_enabled: form.password_reset_enabled,
+      totp_enabled: form.totp_enabled,
       default_balance: form.default_balance,
       default_concurrency: form.default_concurrency,
       site_name: form.site_name,