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/risk_policy_panel.html

@@ -1,9 +1,9 @@
-{# 风控说明：只读展示 .env 风控参数与当前账户状态 #}
+{# 风控说明:只读展示 .env 风控参数与当前账户状态 #}
 <div class="risk-policy-page">
     <div class="card settings-card settings-card--risk">
         <h2>风控说明</h2>
         <p class="settings-live-status">
-            当前账户状态：
+            当前账户状态:
             <span class="risk-status-badge risk-status-{{ risk_status.status|default('normal') }}">
                 {{ instance_settings.risk_status_label }}
             </span>
@@ -12,9 +12,9 @@
             {% endif %}
         </p>
         {% if instance_settings.trade_policy_note %}
-        <p class="settings-policy-note">账户限制：{{ instance_settings.trade_policy_note }}</p>
+        <p class="settings-policy-note">账户限制:{{ instance_settings.trade_policy_note }}</p>
         {% endif %}
-        <p class="settings-env-hint">以下参数读取自本实例 <code>.env</code>，修改后需重启进程生效。</p>
+        <p class="settings-env-hint">以下参数读取自本实例 <code>.env</code>,修改后需重启进程生效.</p>
         <div class="settings-risk-sections">
             {% for section in instance_settings.sections %}
             <div class="card settings-subcard">