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/env_config_panel.html

@@ -1,10 +1,10 @@
-{# env配置：CSS Tab（无需 JS）+ 双列表单 #}
+{# env配置:CSS Tab(无需 JS)+ 双列表单 #}
 <div class="env-config-page">
     <div class="env-config-head card">
         <div class="env-config-head-row">
             <div>
                 <h2>env 配置</h2>
-                <p class="settings-env-hint env-config-head-hint">按分类修改，改完点保存。含「需重启」的项请用「保存并重启」。<strong>AI 配置</strong>请在中控 → 系统设置 → AI 配置统一维护。</p>
+                <p class="settings-env-hint env-config-head-hint">按分类修改,改完点保存.含「需重启」的项请用「保存并重启」.<strong>AI 配置</strong>请在中控 → 系统设置 → AI 配置统一维护.</p>
             </div>
             <div class="env-config-toolbar">
                 <button type="button" class="btn-primary btn-sm" id="env-config-save">保存</button>
@@ -29,7 +29,7 @@
             {% for group in env_config_groups %}
             <section class="env-panel env-panel--{{ loop.index0 }}" role="tabpanel">
                 {% if group.has_restart %}
-                <p class="env-panel-hint">本组含需重启项，修改后请点「保存并重启」。</p>
+                <p class="env-panel-hint">本组含需重启项,修改后请点「保存并重启」.</p>
                 {% endif %}
                 <div class="env-form-grid">
                     {% for field in group.fields %}
@@ -56,7 +56,7 @@
                             id="env-f-{{ field.key }}"
                             type="password"
                             data-env-key="{{ field.key }}"
-                            placeholder="{% if field.has_value %}修改时填写新值，留空不修改{% else %}请输入{% endif %}"
+                            placeholder="{% if field.has_value %}修改时填写新值,留空不修改{% else %}请输入{% endif %}"
                             autocomplete="off"
                         >
                         {% else %}