Add clear-and-refetch for hub K-line cache.

Force refresh wipes the series in hub_kline.db before pulling from the exchange; add a Linux clear script and rename the UI button to 清库重拉.

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

manual_trading_hub/static/index.html

@@ -98,7 +98,7 @@
           </select>
         </label>
         <button type="button" id="market-load" class="primary">加载</button>
-        <button type="button" id="market-refresh" class="ghost">强制刷新</button>
+        <button type="button" id="market-refresh" class="ghost" title="清空该币种本周期 K 线缓存并从交易所重新拉取">清库重拉</button>
         <span class="toolbar-spacer"></span>
         <span id="market-bar-countdown" class="toolbar-meta market-countdown"></span>
         <span id="market-updated" class="toolbar-meta"></span>
@@ -349,7 +349,7 @@
 
   <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=20260608-fetch-fix"></script>
+  <script src="/assets/chart.js?v=20260608-clear-refetch"></script>
   <script src="/assets/archive.js?v=20260607-hub-archive-v6"></script>
   <script src="/assets/ai_review_render.js?v=2"></script>
   <script src="/assets/app.js?v=20260607-hub-archive-v1"></script>