feat(web): Header ⌘K 搜尋提示按鈕 + sensor service file 補齊

Header:
- 新增 ⌘K 入口按鈕（搜尋圖示 + "搜尋..." + ⌘K badge）
- 點擊觸發 window keydown(meta+k) 開啟 CommandPalette
- hover 變藍（UX 提示）

Sensor:
- 補齊 apps/sensor/awoooi-sensor.service（PYTHONUNBUFFERED=1 + --loop）

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/sensor/awoooi-sensor.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=AWOOOI Sensor Agent -- Phase 5.5 神經末梢
+After=network.target
+
+[Service]
+Type=simple
+WorkingDirectory=%h/awoooi-sensor
+ExecStart=/usr/bin/python3 -u %h/awoooi-sensor/agent.py --loop --interval 30
+Restart=always
+RestartSec=10
+StandardOutput=journal
+StandardError=journal
+Environment=AWOOOI_REDIS_URL=redis://192.168.0.188:6380/10
+Environment=PYTHONUNBUFFERED=1
+
+[Install]
+WantedBy=default.target

apps/web/messages/en.json

@@ -205,6 +205,7 @@
     "aiModelStatus": "AI Model Status",
     "loading": "Loading...",
     "trendUp": "↑{pct}%",
+    "searchPlaceholderShort": "Search...",
     "cotTitle": "Reasoning Timeline",
     "cotNoEvents": "Waiting for reasoning data...",
     "cotReasoning": "Reasoning",

apps/web/messages/zh-TW.json

@@ -206,6 +206,7 @@
     "aiModelStatus": "AI 模型狀態",
     "loading": "載入中...",
     "trendUp": "↑{pct}%",
+    "searchPlaceholderShort": "搜尋...",
     "cotTitle": "推理時間軸",
     "cotNoEvents": "等待事件推理資料...",
     "cotReasoning": "推理",

apps/web/src/components/layout/header.tsx

@@ -143,6 +143,27 @@ export function Header({
           {tDashboard('title')}
         </span>
 
+        {/* ⌘K Command Palette 入口提示 */}
+        <button
+          onClick={() => {
+            const e = new KeyboardEvent('keydown', { key: 'k', metaKey: true, bubbles: true })
+            window.dispatchEvent(e)
+          }}
+          style={{
+            display: 'flex', alignItems: 'center', gap: 6,
+            padding: '5px 12px',
+            background: '#fff', border: '0.5px solid #e0ddd4', borderRadius: 8,
+            cursor: 'pointer', fontSize: 11, color: '#87867f',
+            transition: 'all 0.15s',
+          }}
+          onMouseEnter={e => { (e.currentTarget as HTMLButtonElement).style.borderColor = '#4A90D9'; (e.currentTarget as HTMLButtonElement).style.color = '#4A90D9' }}
+          onMouseLeave={e => { (e.currentTarget as HTMLButtonElement).style.borderColor = '#e0ddd4'; (e.currentTarget as HTMLButtonElement).style.color = '#87867f' }}
+        >
+          <svg width="11" height="11" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round"><circle cx="11" cy="11" r="8"/><path d="m21 21-4.35-4.35"/></svg>
+          <span style={{ fontFamily: 'var(--font-body), monospace' }}>{tDashboard('searchPlaceholderShort')}</span>
+          <kbd style={{ fontSize: 9, background: '#f0ede5', borderRadius: 3, padding: '1px 5px', fontFamily: 'monospace', color: '#87867f' }}>⌘K</kbd>
+        </button>
+
         {/* Language switcher — pill style */}
         <button
           onClick={() => switchLocale('zh-TW')}