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.html

@@ -14,7 +14,7 @@
     <div class="box">
         <h1>趋势回调</h1>
         <p>{{ trend_note }}</p>
-        <p style="color:#8892b0;font-size:.9rem">趋势回调含自动补仓档位，在三所实例（Binance / Gate / OKX）中均可启用，须配置 LIVE_TRADING_ENABLED=true。</p>
+        <p style="color:#8892b0;font-size:.9rem">趋势回调含自动补仓档位,在三所实例(Binance / Gate / OKX)中均可启用,须配置 LIVE_TRADING_ENABLED=true.</p>
     </div>
 </body>
 </html>