feat(web): Phase 7.0 minimalist 5-pillar navigation

- Refactor sidebar to Nothing.tech visual compliance
- Add defensive route stubs for /authorizations, /knowledge-base, /settings
- Dynamic badge for pending approvals count
- Ultra-minimal borders (0.5px), no shadows

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

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

@@ -0,0 +1,29 @@
+'use client'
+
+/**
+ * Authorizations Page - 授權中心
+ * ==============================
+ * Phase 7.0: 防禦性路由佔位
+ *
+ * Nothing.tech 空態設計:
+ * - 畫面正中央極簡文字
+ * - 等寬字體 + 淺灰色
+ */
+
+import { AppLayout } from '@/components/layout'
+
+export default function AuthorizationsPage({
+  params,
+}: {
+  params: { locale: string }
+}) {
+  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 ]
+        </p>
+      </div>
+    </AppLayout>
+  )
+}

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

@@ -0,0 +1,29 @@
+'use client'
+
+/**
+ * Knowledge Base Page - 知識殿堂
+ * ==============================
+ * Phase 7.0: 防禦性路由佔位
+ *
+ * Nothing.tech 空態設計:
+ * - 畫面正中央極簡文字
+ * - 等寬字體 + 淺灰色
+ */
+
+import { AppLayout } from '@/components/layout'
+
+export default function KnowledgeBasePage({
+  params,
+}: {
+  params: { locale: string }
+}) {
+  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 ]
+        </p>
+      </div>
+    </AppLayout>
+  )
+}

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

@@ -0,0 +1,29 @@
+'use client'
+
+/**
+ * Settings Page - 系統設定
+ * ========================
+ * Phase 7.0: 防禦性路由佔位
+ *
+ * Nothing.tech 空態設計:
+ * - 畫面正中央極簡文字
+ * - 等寬字體 + 淺灰色
+ */
+
+import { AppLayout } from '@/components/layout'
+
+export default function SettingsPage({
+  params,
+}: {
+  params: { locale: string }
+}) {
+  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 ]
+        </p>
+      </div>
+    </AppLayout>
+  )
+}