Normalize fullwidth punctuation to ASCII across codebase.

Add scripts/normalize_ambiguous_unicode.py; fix corrupted patch_instance_theme_templates.py. Preserves curly quotes in string literals; removes Git homoglyph warnings on .env.example.

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

manual_trading_hub/static/calculator.js

@@ -1,5 +1,5 @@
 /**
- * 中控策略计算器：趋势回调 / 滚仓历史测算
+ * 中控策略计算器:趋势回调 / 滚仓历史测算
  */
 (function () {
   const page = document.getElementById("page-calculator");
@@ -42,7 +42,7 @@
     return String(n);
   }
 
-  /** 去掉尾部多余 0，用于乘数/精度展示 */
+  /** 去掉尾部多余 0,用于乘数/精度展示 */
   function fmtTrim(v, maxDigits) {
     if (v == null || v === "") return "—";
     const n = Number(v);
@@ -376,7 +376,7 @@
       "<div><span>单次风险预算</span><strong>" +
       fmt(data.risk_budget_u, 2) +
       "U</strong></div>" +
-      "<div><span>首仓张数（自动）</span><strong>" +
+      "<div><span>首仓张数(自动)</span><strong>" +
       fmt(data.first_contracts, amt) +
       "</strong></div>" +
       "<div><span>最终累计张数</span><strong>" +