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/instance/templates/instance_header_panel.html

@@ -1,8 +1,8 @@
-{# 统一顶栏：状态 + 筛选（上）· 统计条（下） #}
+{# 统一顶栏:状态 + 筛选(上)· 统计条(下) #}
 <div class="instance-header-panel card">
     <div class="instance-header-toolbar">
         <div class="instance-header-toolbar-filter">
-            <span class="list-window-label" title="列表按 UTC 时间筛选，默认本月">UTC {{ list_window.label }}</span>
+            <span class="list-window-label" title="列表按 UTC 时间筛选,默认本月">UTC {{ list_window.label }}</span>
             <label class="list-window-preset">预设
                 <select id="win-preset-select" onchange="toggleListWindowCustom()">
                     <option value="utc_this_month" {% if list_window.preset == 'utc_this_month' %}selected{% endif %}>本月</option>
@@ -26,7 +26,7 @@
             <div class="instance-toolbar-status">
                 <div class="exchange-tag">{{ exchange_display }}</div>
                 {% if trade_policy.badge_text %}
-                <span class="trade-policy-badge" title="账户交易限制（.env）">{{ trade_policy.badge_text }}</span>
+                <span class="trade-policy-badge" title="账户交易限制(.env)">{{ trade_policy.badge_text }}</span>
                 {% endif %}
                 {% include 'force_close_header_badge.html' %}
                 <span class="risk-status-badge risk-status-{{ risk_status.status|default('normal') }}" id="account-risk-badge" role="status" title="{{ risk_status.reason|default('', true) }}" data-status-label="{{ risk_status.status_label|default('正常') }}"{% if risk_status.freeze_until_ms %} data-freeze-until-ms="{{ risk_status.freeze_until_ms }}"{% endif %}>{{ risk_status.status_label|default('正常') }}</span>