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/key_focus_v2.html

@@ -29,9 +29,9 @@
       </div>
       <div class="row">
         <a class="btn" href="/">返回首页</a>
-        <strong class="focus-title">关键位放大{% if trade_policy.symbol_restrict_enabled %}（选择币种）{% else %}（可输入币种）{% endif %}</strong><span class="exchange-tag">{{ exchange_display }}</span>
+        <strong class="focus-title">关键位放大{% if trade_policy.symbol_restrict_enabled %}(选择币种){% else %}(可输入币种){% endif %}</strong><span class="exchange-tag">{{ exchange_display }}</span>
       </div>
-      <div class="status">最近刷新：<span id="updated-at">--</span></div>
+      <div class="status">最近刷新:<span id="updated-at">--</span></div>
     </div>
     <div class="row" style="margin-top:10px">
       <label>币种</label>
@@ -41,7 +41,7 @@
       {{ symbol_live_price_hint('key-focus-symbol-live-price', 'symbol-input') }}
       <label>关键位</label>
       <select id="key-id">
-        <option value="">无（仅看K线）</option>
+        <option value="">无(仅看K线)</option>
         {% for k in key_list %}
         <option value="{{ k.id }}" {% if selected_key and k.id == selected_key.id %}selected{% endif %}>#{{ k.id }} {{ k.symbol }} {{ k.monitor_type }} {{ '做多' if k.direction == 'long' else '做空' }}</option>
         {% endfor %}