feat(keyboard): ship AI mode surface with streaming search answers

Add the AI keyboard tab, Agent settings, and user-owned LLM key path for 1.7.0, including streaming answers and web-search transports without the built-in DeepSeek fallback.

docs/osgkeyboardversion.html

@@ -176,6 +176,125 @@
   <p class="empty" id="empty-zh">暂无与当前版本匹配的更新说明。</p>
   <p class="empty" id="empty-en">No release notes match this app version.</p>
 
+  <!-- ========== 1.7.0 ========== -->
+  <article class="version-block" data-version="1.7.0">
+    <div class="version-chip">1.7.0</div>
+
+    <div class="lang-block" data-lang="zh">
+      <section class="section">
+        <h2>新功能</h2>
+
+        <div class="group">
+          <p class="group-title">AI 键盘模式</p>
+          <ul>
+            <li>新增临时多轮 AI 输入面：把口述问题直接交给已配置模型，滚动查看最新答案，再通过「插入」或「发送」写入当前输入框</li>
+            <li>只有真正插入的答案会进入历史与 AI 字数统计</li>
+            <li>支持服务商侧联网搜索（在可用时自动启用），并强制开启 thinking；失败时会静默改为无搜索重试</li>
+          </ul>
+        </div>
+
+        <div class="group">
+          <p class="group-title">API Key 与模型</p>
+          <ul>
+            <li>润色与 AI 模式均需自行填写 API Key；未配置时首页与麦克风上方会提示，听写仍可插入原始识别结果</li>
+            <li>更新多家服务商的默认模型（含 OpenAI <code>gpt-5.4-mini</code>）；已保存的模型名不受影响</li>
+          </ul>
+        </div>
+
+        <div class="group">
+          <p class="group-title">iPad 体验</p>
+          <ul>
+            <li>语音面与打字面新增系统 🌐 键（轻点切换键盘，长按打开系统键盘列表）</li>
+            <li>打字布局适配 iPad：更高键行、横竖屏缩进、首行数字角标，并铺满宿主宽度</li>
+            <li>打字顶栏新增撤销 / 重做 / 拷贝 / 剪切</li>
+          </ul>
+        </div>
+
+        <div class="group">
+          <p class="group-title">编辑上次输入</p>
+          <ul>
+            <li>长按麦克风口述如何修改最近一次已验证输入，预览后可替换或追加，且不暴露无关输入框内容</li>
+          </ul>
+        </div>
+      </section>
+
+      <section class="section">
+        <h2>变更</h2>
+        <ul>
+          <li>移除内置 DeepSeek Key 回退；本地 / 云端润色与 AI 均使用你自己的 Key</li>
+          <li>移除键盘长按剪贴板语音指令相关能力；普通听写、编辑上次输入与拷贝 / 剪切仍可用</li>
+          <li>隐私政策补充：用户自备 LLM Key、AI 模式可选联网搜索</li>
+        </ul>
+      </section>
+
+      <section class="section">
+        <h2>问题修复</h2>
+        <ul>
+          <li>修复中文输入引擎长期无法初始化：部署改为在引导与打开 App 时确定性执行，键盘可在部署完成后自动恢复</li>
+          <li>修复润色代答问句：口述问句时保留问句本身，不再被改写成回答</li>
+          <li>多项 iPad 布局、录音取消、连续编辑与首录速度相关修复</li>
+        </ul>
+      </section>
+    </div>
+
+    <div class="lang-block" data-lang="en">
+      <section class="section">
+        <h2>New Features</h2>
+
+        <div class="group">
+          <p class="group-title">AI keyboard mode</p>
+          <ul>
+            <li>Temporary multi-turn AI surface: send spoken questions to your configured model, review the latest answer, then Insert or Send into the host field</li>
+            <li>Only inserted answers enter history and AI character statistics</li>
+            <li>Provider-side web search when available, with thinking forced on; silent retry without search on failure</li>
+          </ul>
+        </div>
+
+        <div class="group">
+          <p class="group-title">API keys &amp; models</p>
+          <ul>
+            <li>Polish and AI mode require your own API key; Home and the mic line tip you when it’s missing, while dictation still inserts raw ASR</li>
+            <li>Refreshed default models across providers (including OpenAI <code>gpt-5.4-mini</code>); saved model names are unchanged</li>
+          </ul>
+        </div>
+
+        <div class="group">
+          <p class="group-title">iPad</p>
+          <ul>
+            <li>System 🌐 key on voice and typing surfaces (tap to switch, long-press for the system picker)</li>
+            <li>Typing layout adapted for iPad: taller rows, orientation-aware inset, number overlays, full host width</li>
+            <li>Undo / redo / copy / cut cluster on the typing top bar</li>
+          </ul>
+        </div>
+
+        <div class="group">
+          <p class="group-title">Edit last input</p>
+          <ul>
+            <li>Long-press the mic to describe changes to the last verified insertion, then preview and replace or append — without exposing unrelated field text</li>
+          </ul>
+        </div>
+      </section>
+
+      <section class="section">
+        <h2>Changes</h2>
+        <ul>
+          <li>Removed the built-in DeepSeek key fallback; local/cloud polish and AI use your key only</li>
+          <li>Removed clipboard voice-command capture from the iOS keyboard; normal dictation, last-input editing, and copy/cut remain</li>
+          <li>Privacy policy updated for user-owned LLM keys and optional AI-mode provider web search</li>
+        </ul>
+      </section>
+
+      <section class="section">
+        <h2>Fixes</h2>
+        <ul>
+          <li>Chinese input engine can initialize reliably: host deployment runs deterministically during onboarding / app open, and the keyboard recovers after deployment completes</li>
+          <li>Polish no longer answers question drafts — questions stay questions across styles and intensities</li>
+          <li>Multiple iPad layout, cancel-while-recording, repeat-edit, and first-mic latency fixes</li>
+        </ul>
+      </section>
+    </div>
+  </article>
+
   <!-- ========== 1.6.6 ========== -->
   <article class="version-block" data-version="1.6.6">
     <div class="version-chip">1.6.6</div>