feat: 币种输入旁实时显示交易所现价

Shared SymbolLivePrice polls /api/order_defaults on input with debounce; wired to trade, key monitor, trend, and key focus forms.

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

lib/instance/templates/embed_boot_scripts.html

@@ -1155,7 +1155,10 @@ function refreshAccountSnapshot(){
 const orderSymbolEl = document.getElementById("order-symbol");
 const orderDirectionEl = document.getElementById("order-direction");
 const fullMarginEl = document.getElementById("use-full-margin");
-if(orderSymbolEl) orderSymbolEl.addEventListener("change", refreshOrderDefaults);
+if(orderSymbolEl) {
+    orderSymbolEl.addEventListener("change", refreshOrderDefaults);
+    orderSymbolEl.addEventListener("input", refreshOrderDefaults);
+}
 if(orderDirectionEl) orderDirectionEl.addEventListener("change", refreshOrderDefaults);
 if(fullMarginEl){
     fullMarginEl.addEventListener("change", function(){