feat(t122 🔴🔴): 萃取引擎雲端設定＋隨連線下發——封測者終於萃得出東西

真兇（總管查證）：daemon/config 寫死 extractor='claude' 且不下發金鑰 ⇒ 封測者 100% 萃取失敗
（leo：「地端沒有 AI 根本不能萃，那它就不能玩」）。
- POST/GET /portal/admin/extractor（admin 閘；GET 只回 has_key 不回明文）
- daemon/config 改讀設定：未設定→gemma 無金鑰；設定後→含 gemini_api_key
- portal 設定頁加「萃取引擎」區（Gemini 推薦＋aistudio 連結，存後提示「小幫手點連上知識庫重連即可」）
測試 3 條新綠（vitest 17 passed；1 紅＝console HTML 搬遷陳舊測試，非本案）。
（實作＝子 CC；驗證+commit＝總管）

console-ui/public/portal/index.html

@@ -356,6 +356,29 @@
           <div id="st-key-status" style="font-size:14px;min-height:1.2em"></div>
         </div>
       </div>
+      <!-- t122 萃取引擎（daemon 萃取知識卡用的 AI；admin-level，同 chat-key；server 再強制閘） -->
+      <div class="panel" id="st-extractor-panel">
+        <div style="font-size:17px;font-weight:600">萃取引擎</div>
+        <div style="margin-top:4px;font-size:14px;line-height:1.65;color:rgba(var(--ink-rgb),.55)">同步小幫手把你的文件變成知識卡時用的 AI。選好後請讓小幫手重連一次。</div>
+        <div style="margin-top:14px;display:flex;flex-direction:column;gap:10px">
+          <div style="display:flex;gap:16px;align-items:center">
+            <label style="display:flex;gap:6px;align-items:center;cursor:pointer;font-size:14px">
+              <input type="radio" name="st-extractor-engine" id="st-engine-gemma" value="gemma" checked>
+              <span>Gemini（推薦，免費）</span>
+            </label>
+            <label style="display:flex;gap:6px;align-items:center;cursor:pointer;font-size:14px">
+              <input type="radio" name="st-extractor-engine" id="st-engine-claude" value="claude">
+              <span>Claude Code（本機已裝才選）</span>
+            </label>
+          </div>
+          <div id="st-extractor-key-row" style="display:flex;flex-direction:column;gap:8px">
+            <div style="font-size:13px;color:rgba(var(--ink-rgb),.55)">到 <a href="https://aistudio.google.com/apikey" target="_blank" rel="noopener">aistudio.google.com/apikey</a> 免費取得金鑰</div>
+            <input type="password" id="st-extractor-key" class="txt" placeholder="貼上 Gemini API 金鑰（留空＝不變更）" autocomplete="off">
+          </div>
+          <button class="btn" id="st-extractor-save">儲存萃取引擎設定</button>
+          <div id="st-extractor-status" style="font-size:14px;min-height:1.2em"></div>
+        </div>
+      </div>
       <button class="btn3" id="st-logout" style="padding:14px;font-size:16px;border-radius:11px">登出</button>
     </div>
   </div>
@@ -793,6 +816,70 @@ function taipeiMonthDay(ms) { var d = new Date(ms + TAIPEI_OFFSET_MS); return {
     });
   })();
 
+  // t122 萃取引擎設定（engine 切換顯示隱藏金鑰輸入框 + 存檔）
+  (function () {
+    // 引擎切換：Gemini 顯示金鑰欄；Claude Code 隱藏
+    function updateExtractorKeyRowVisibility() {
+      var row = $('st-extractor-key-row');
+      if (!row) return;
+      var el = document.getElementById('st-engine-gemma');
+      row.style.display = (el && el.checked) ? '' : 'none';
+    }
+    ['st-engine-gemma', 'st-engine-claude'].forEach(function (id) {
+      var el = document.getElementById(id);
+      if (el) el.addEventListener('change', updateExtractorKeyRowVisibility);
+    });
+    updateExtractorKeyRowVisibility();
+
+    // 進入設定頁時讀取現有設定（GET /portal/admin/extractor）
+    function loadExtractorConfig() {
+      if (!(S.profile && S.profile.role === 'admin')) return;
+      fetch(API_BASE + '/portal/admin/extractor', { headers: authHeaders() })
+        .then(function (r) { return r.ok ? r.json() : null; })
+        .then(function (d) {
+          if (!d) return;
+          var gemmaEl = document.getElementById('st-engine-gemma');
+          var claudeEl = document.getElementById('st-engine-claude');
+          if (d.engine === 'claude' && claudeEl) claudeEl.checked = true;
+          else if (gemmaEl) gemmaEl.checked = true;
+          updateExtractorKeyRowVisibility();
+          if (d.has_key) {
+            var ki = $('st-extractor-key');
+            if (ki) ki.placeholder = '已設定（留空＝不變更）';
+          }
+        })
+        .catch(function () { /* 讀不到不擋頁面 */ });
+    }
+
+    // 存檔
+    var sb = $('st-extractor-save');
+    if (sb) sb.addEventListener('click', function () {
+      var m = $('st-extractor-status');
+      var engineEl = document.querySelector('input[name="st-extractor-engine"]:checked');
+      var engine = engineEl ? engineEl.value : 'gemma';
+      var key = (($('st-extractor-key') && $('st-extractor-key').value) || '').trim();
+      var body = { engine: engine };
+      if (engine === 'gemma' && key) body.gemini_api_key = key;
+      sb.disabled = true; m.textContent = '儲存中…'; m.style.color = '';
+      fetch(API_BASE + '/portal/admin/extractor', {
+        method: 'POST',
+        headers: Object.assign({ 'Content-Type': 'application/json' }, authHeaders()),
+        body: JSON.stringify(body)
+      }).then(function (r) { return safeJson(r).then(function (d) { return { ok: r.ok, status: r.status, d: d }; }); })
+        .then(function (x) {
+          sb.disabled = false;
+          if (guard401(x.status)) return;
+          if (!x.ok) { m.textContent = (x.d && x.d.error) || '儲存失敗'; m.style.color = '#b4462f'; return; }
+          if ($('st-extractor-key')) { $('st-extractor-key').value = ''; $('st-extractor-key').placeholder = '已設定（留空＝不變更）'; }
+          m.textContent = '已儲存。小幫手請點「連上知識庫」重連一次即可生效'; m.style.color = '#3f7a4f';
+        })
+        .catch(function (e) { sb.disabled = false; m.textContent = friendlyErr(e); m.style.color = '#b4462f'; });
+    });
+
+    // loadExtractorConfig 掛到全域（供 loadSettings 呼叫）
+    window._loadExtractorConfig = loadExtractorConfig;
+  })();
+
   $('st-logout').addEventListener('click', function () {
     fetch(API_BASE + '/portal/logout', { method: 'POST', headers: authHeaders() }).catch(function () { /* 盡力而為 */ });
     dropSession();
@@ -1605,6 +1692,7 @@ function taipeiMonthDay(ms) { var d = new Date(ms + TAIPEI_OFFSET_MS); return {
   function loadSettings() {
     var p = S.profile;
     if (!p) { $('st-me').innerHTML = '<div class="muted">載入中…</div>'; return; }
+    if (window._loadExtractorConfig) window._loadExtractorConfig();
     var libs = p.libraries || [];
     var libHtml = libs.indexOf('*') >= 0
       ? '<span class="tag green">全部知識庫</span>'