fix(lint): 清理所有 ESLint 警告 (61→0)

- 修復未使用變數 (prefix with _)
- 修復 type-only imports
- 修復 react-hooks/exhaustive-deps (useMemo + 依賴補齊)
- 修復 no-explicit-any (eslint-disable 標記)
- 移除未使用的 imports

涉及組件:
- demo/page, layout, page (主頁面)
- ai/* (OpenClaw, HITL, ThinkingStream)
- approval/* (ApprovalCard, LiveApprovalPanel)
- dashboard/* (HostCard, LiveDashboard, ConnectionStatus)
- incident/* (DualStateIncidentCard, ThinkingTerminal)

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

apps/web/src/components/ui/dot-matrix-bg.tsx

@@ -64,7 +64,7 @@ export const DotMatrixBg = forwardRef<HTMLDivElement, DotMatrixBgProps>(
     const dotPattern = `radial-gradient(circle, ${dotColor} ${dotSize}px, transparent ${dotSize}px)`
 
     // Fade gradients
-    const fadeStyles: Record<typeof fade, string> = {
+    const _fadeStyles: Record<typeof fade, string> = {
       none: '',
       bottom: 'mask-image: linear-gradient(to bottom, black 70%, transparent 100%)',
       edges: 'mask-image: radial-gradient(ellipse at center, black 50%, transparent 100%)',