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/settings_panel.html

@@ -1,8 +1,8 @@
-{# 系统设置：CSS Tab（与 env 配置同方案） #}
+{# 系统设置:CSS Tab(与 env 配置同方案) #}
 <div class="settings-page">
     <div class="env-config-head card">
         <h2>系统设置</h2>
-        <p class="settings-env-hint env-config-head-hint">各区块说明见 <code>docs/系统设置说明.md</code>。</p>
+        <p class="settings-env-hint env-config-head-hint">各区块说明见 <code>docs/系统设置说明.md</code>.</p>
     </div>
 
     {% if settings_tabs %}
@@ -24,7 +24,7 @@
                     {% include 'password_settings_panel.html' %}
                 {% elif tab.key == 'transfer' %}
                     <h2>永续资金划转</h2>
-                    <p class="settings-subcard-desc">子账户永续：资金账户与交易账户之间划转 USDT。</p>
+                    <p class="settings-subcard-desc">子账户永续:资金账户与交易账户之间划转 USDT.</p>
                     {% include 'instance_transfer_panel.html' %}
                 {% elif tab.key == 'export' %}
                     <h2>数据导出</h2>
@@ -32,7 +32,7 @@
                     <div class="settings-export-links-inline settings-export-links-block">
                         <a href="/export/trade_records">交易记录</a>
                         <a href="/export/journal_entries">复盘记录</a>
-                        <a href="/export/key_monitors">关键位（当前）</a>
+                        <a href="/export/key_monitors">关键位(当前)</a>
                         <a href="/export/key_monitor_history">关键位历史</a>
                     </div>
                 {% elif tab.key == 'options_swap' %}