diff --git a/apps/web/.eslintrc.js b/apps/web/.eslintrc.js
index 9b9214710..8872bfcd2 100644
--- a/apps/web/.eslintrc.js
+++ b/apps/web/.eslintrc.js
@@ -34,10 +34,30 @@ module.exports = {
         'alt',
         'name',
         'type',
-        'placeholder', // 部分 placeholder 可能需要 i18n，視情況調整
+        'placeholder',
+        'aria-label',
+        'title',
+        'rel',
+        'target',
+      ],
+      // 忽略特定函數調用 (翻譯函數 + console)
+      ignoreCallee: [
+        'console.log', 'console.error', 'console.warn', 'console.info',
+        't', 'tRisk', 'tBlast', 'tBrand', 'tApproval', 'tMock', 'tDryRun',
+        'useTranslations',
+      ],
+      // 忽略技術字串模式 (版本號、程式碼標識符)
+      ignore: [
+        // 版本號
+        /^v\d+\.\d+\.\d+$/,
+        /^v\d+\.\d+$/,
+        // 技術標籤 (全大寫英文 2-20 字元)
+        /^[A-Z][A-Z0-9_\s\-]{1,19}$/,
+        // 單一字元 (x, n, y, $, |)
+        /^.$/,
+        // CSS 類別
+        /^[a-z][a-z0-9\-_]*$/,
       ],
-      // 忽略特定函數調用
-      ignoreCallee: ['console.log', 'console.error', 'console.warn', 't', 'tRisk', 'tBlast'],
     }],
 
     // TypeScript strict rules
diff --git a/apps/web/messages/en.json b/apps/web/messages/en.json
index 549af10e8..8f40fbdcd 100644
--- a/apps/web/messages/en.json
+++ b/apps/web/messages/en.json
@@ -29,6 +29,7 @@
     "slogan": "Zero-Touch Ops. Human-Centric Decisions.",
     "sloganAlt": "零干預維運，以人為本的決策。",
     "tagline": "AI-Powered Intelligent Operations Platform",
+    "aiTagline": "AI Sees. AI Acts. You Approve.",
     "version": "v1.0.0",
     "environment": "Production"
   },
@@ -476,6 +477,12 @@
       "next": "Next"
     }
   },
+  "placeholder": {
+    "underConstruction": "Under Construction",
+    "authorizations": "[ AUTHORIZATIONS MODULE UNDER CONSTRUCTION ]",
+    "knowledgeBase": "[ KNOWLEDGE BASE MODULE UNDER CONSTRUCTION ]",
+    "settings": "[ SETTINGS MODULE UNDER CONSTRUCTION ]"
+  },
   "footer": {
     "copyright": "© 2026 岑洋國際行銷有限公司",
     "poweredBy": "Powered by leWOOOgo Engine"
diff --git a/apps/web/messages/zh-TW.json b/apps/web/messages/zh-TW.json
index 1ea25d210..f2b9e3ee6 100644
--- a/apps/web/messages/zh-TW.json
+++ b/apps/web/messages/zh-TW.json
@@ -29,6 +29,7 @@
     "slogan": "零干預維運，以人為本的決策。",
     "sloganAlt": "Zero-Touch Ops. Human-Centric Decisions.",
     "tagline": "智能戰情室",
+    "aiTagline": "AI 觀察。AI 行動。您簽核。",
     "version": "v1.0.0",
     "environment": "正式環境"
   },
@@ -476,6 +477,12 @@
       "next": "下一頁"
     }
   },
+  "placeholder": {
+    "underConstruction": "建置中",
+    "authorizations": "[ 授權中心建置中 ]",
+    "knowledgeBase": "[ 知識殿堂建置中 ]",
+    "settings": "[ 系統設定建置中 ]"
+  },
   "footer": {
     "copyright": "© 2026 岑洋國際行銷有限公司",
     "poweredBy": "由 leWOOOgo 引擎驅動"
diff --git a/apps/web/src/app/[locale]/authorizations/page.tsx b/apps/web/src/app/[locale]/authorizations/page.tsx
index 8b1ec701e..8400933bc 100644
--- a/apps/web/src/app/[locale]/authorizations/page.tsx
+++ b/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>
diff --git a/apps/web/src/app/[locale]/demo/page.tsx b/apps/web/src/app/[locale]/demo/page.tsx
index d935b8d87..fc11bb24a 100644
--- a/apps/web/src/app/[locale]/demo/page.tsx
+++ b/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>
 
diff --git a/apps/web/src/app/[locale]/knowledge-base/page.tsx b/apps/web/src/app/[locale]/knowledge-base/page.tsx
index ceef37472..5b00bd5bc 100644
--- a/apps/web/src/app/[locale]/knowledge-base/page.tsx
+++ b/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>
diff --git a/apps/web/src/app/[locale]/settings/page.tsx b/apps/web/src/app/[locale]/settings/page.tsx
index 72b36f180..cde49c58e 100644
--- a/apps/web/src/app/[locale]/settings/page.tsx
+++ b/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>