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>

lib/strategy/templates/strategy_trend_disabled_panel.html

@@ -2,15 +2,15 @@
 <div class="card trend-card" style="grid-column:1/-1">
     <h2 style="margin-bottom:8px">趋势回调</h2>
     <details class="tip-collapse strategy-trend-disabled-collapse">
-        <summary class="tip-collapse-summary">趋势回调说明（本实例未启用）</summary>
+        <summary class="tip-collapse-summary">趋势回调说明(本实例未启用)</summary>
         <div class="tip-collapse-body rule-tip">
             {{ trend_disabled_note }}<br><br>
-            趋势回调含自动补仓档位与预览执行，在 <strong>Binance / Gate / OKX</strong> 各实例的「策略交易 → 趋势回调」中运行。
-            请访问对应实例同一菜单，或常用地址如 Gate <code>:5000/strategy/trend</code>。
+            趋势回调含自动补仓档位与预览执行,在 <strong>Binance / Gate / OKX</strong> 各实例的「策略交易 → 趋势回调」中运行.
+            请访问对应实例同一菜单,或常用地址如 Gate <code>:5000/strategy/trend</code>.
         </div>
     </details>
     <p style="margin-top:12px;font-size:.85rem">
         <a href="/trade" style="color:#8fc8ff">返回实盘下单</a>
-        ｜ <a href="/strategy/roll" style="color:#8fc8ff">顺势加仓（本实例可用）</a>
+        ｜ <a href="/strategy/roll" style="color:#8fc8ff">顺势加仓(本实例可用)</a>
     </p>
 </div>