修复 OKX K 线无 since 时只拉 300 根的问题，并加入行情快捷键

- fetch_ohlcv_for_hub：无 since 时按目标根数分页拉取（OKX/Gate 单次约 300）

- hub_kline_store 全量补拉传 fetch_start_ms

- 行情区：数字键切换周期、Ctrl+空格全屏、Esc 退出全屏

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/static/index.html

@@ -60,7 +60,7 @@
     <div id="page-market" class="page hidden">
       <div class="page-head">
         <h1><span class="head-tag">MKT</span> 行情区</h1>
-        <p class="page-desc">按需拉取 K 线，本地库保留 15 天（无后台自动更新）</p>
+        <p class="page-desc">按需拉取 K 线，本地库保留 15 天（无后台自动更新）。快捷键：<kbd>Ctrl</kbd>+<kbd>空格</kbd> 全屏/退出全屏（全屏时 <kbd>Esc</kbd> 退出）；数字键切换周期（分钟）：1/5/15/60/240/1440/10080。</p>
       </div>
       <details class="hint-box">
         <summary>数据说明</summary>
@@ -112,7 +112,7 @@
                   <label class="market-ind-opt"><input type="checkbox" id="market-ind-rsi" value="rsi" /> RSI</label>
                 </div>
               </details>
-              <button type="button" id="market-chart-fullscreen" class="ghost market-fs-btn" title="K线全屏">全屏</button>
+              <button type="button" id="market-chart-fullscreen" class="ghost market-fs-btn" title="K线全屏（Ctrl+空格）">全屏</button>
             </div>
           </div>
           <div class="market-ohlcv-row">
@@ -240,7 +240,7 @@
 
   <div id="toast"></div>
   <script src="https://unpkg.com/lightweight-charts@4.2.0/dist/lightweight-charts.standalone.production.js"></script>
-  <script src="/assets/chart.js?v=20260528-hub-ind-pane-fix"></script>
+  <script src="/assets/chart.js?v=20260528-hub-fs-keys"></script>
   <script src="/assets/app.js?v=20260528-hub-tpsl-fix"></script>
 </body>
 </html>