fix(i18n): 修復 placeholder 頁面硬編碼字串 + 擴展 ESLint ignore

Wave 3 i18n 合規修復:
- authorizations/knowledge-base/settings 頁面改用 t('placeholder.xxx')
- demo 頁面 brand tagline 改用 tBrand('aiTagline')
- 新增 placeholder i18n keys (zh-TW/en)
- ESLint 擴展 ignoreAttribute/ignoreCallee 覆蓋更多技術標籤

剩餘 83 個 warn 為技術組件中的英文標籤 (LIVE/SSE/Multi-Sig)
Phase 1 warn 模式可接受，待 Phase 2 升級 error 前處理

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

apps/web/src/app/[locale]/authorizations/page.tsx

@@ -4,6 +4,7 @@
  * Authorizations Page - 授權中心
  * ==============================
  * Phase 7.0: 防禦性路由佔位
+ * Wave 3: i18n 國際化支援 (2026-03-31)
  *
  * Nothing.tech 空態設計:
  * - 畫面正中央極簡文字
@@ -11,17 +12,20 @@
  */
 
 import { AppLayout } from '@/components/layout'
+import { useTranslations } from 'next-intl'
 
 export default function AuthorizationsPage({
   params,
 }: {
   params: { locale: string }
 }) {
+  const t = useTranslations('placeholder')
+
   return (
     <AppLayout locale={params.locale}>
       <div className="flex items-center justify-center min-h-[60vh]">
         <p className="font-mono text-sm text-neutral-400 tracking-wider">
-          [ 授權中心建置中 / AUTHORIZATIONS_MODULE_UNDER_CONSTRUCTION ]
+          {t('authorizations')}
         </p>
       </div>
     </AppLayout>

apps/web/src/app/[locale]/demo/page.tsx

@@ -87,6 +87,7 @@ async function createTestApprovalWithConfig(
 
 export default function DemoPage({ params }: { params: { locale: string } }) {
   const t = useTranslations('demo')
+  const tBrand = useTranslations('brand')
   const tApproval = useTranslations('approval')
   const tMock = useTranslations('mockData')
   const tDryRun = useTranslations('dryRun')
@@ -152,7 +153,7 @@ export default function DemoPage({ params }: { params: { locale: string } }) {
             AWOOOI
           </h1>
           <p className="font-dot-matrix text-lg text-claw-blue">
-            AI Sees. AI Acts. You Approve.
+            {tBrand('aiTagline')}
           </p>
         </header>
 

apps/web/src/app/[locale]/knowledge-base/page.tsx

@@ -4,6 +4,7 @@
  * Knowledge Base Page - 知識殿堂
  * ==============================
  * Phase 7.0: 防禦性路由佔位
+ * Wave 3: i18n 國際化支援 (2026-03-31)
  *
  * Nothing.tech 空態設計:
  * - 畫面正中央極簡文字
@@ -11,17 +12,20 @@
  */
 
 import { AppLayout } from '@/components/layout'
+import { useTranslations } from 'next-intl'
 
 export default function KnowledgeBasePage({
   params,
 }: {
   params: { locale: string }
 }) {
+  const t = useTranslations('placeholder')
+
   return (
     <AppLayout locale={params.locale}>
       <div className="flex items-center justify-center min-h-[60vh]">
         <p className="font-mono text-sm text-neutral-400 tracking-wider">
-          [ 知識殿堂建置中 / KNOWLEDGE_BASE_MODULE_UNDER_CONSTRUCTION ]
+          {t('knowledgeBase')}
         </p>
       </div>
     </AppLayout>

apps/web/src/app/[locale]/settings/page.tsx

@@ -4,6 +4,7 @@
  * Settings Page - 系統設定
  * ========================
  * Phase 7.0: 防禦性路由佔位
+ * Wave 3: i18n 國際化支援 (2026-03-31)
  *
  * Nothing.tech 空態設計:
  * - 畫面正中央極簡文字
@@ -11,17 +12,20 @@
  */
 
 import { AppLayout } from '@/components/layout'
+import { useTranslations } from 'next-intl'
 
 export default function SettingsPage({
   params,
 }: {
   params: { locale: string }
 }) {
+  const t = useTranslations('placeholder')
+
   return (
     <AppLayout locale={params.locale}>
       <div className="flex items-center justify-center min-h-[60vh]">
         <p className="font-mono text-sm text-neutral-400 tracking-wider">
-          [ 系統設定建置中 / SETTINGS_MODULE_UNDER_CONSTRUCTION ]
+          {t('settings')}
         </p>
       </div>
     </AppLayout>