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>

scripts/patch_instance_theme_templates.py

@@ -1,5 +1,5 @@
-#!/usr/bin/env python3
-"""涓哄洓鎵€ templates 娉ㄥ叆 instance_theme 鑴氭湰/鏍峰紡涓庡垏鎹㈡寜閽€?""
+#!/usr/bin/env python3
+"""为四所 templates 注入 instance_theme 脚本/样式与切换按钮."""
 from __future__ import annotations
 
 from pathlib import Path
@@ -11,13 +11,13 @@ FILES = ("index.html", "login.html", "key_focus_v2.html", "order_focus_v2.html")
 SCRIPT_TAG = '    <script src="/static/instance_theme.js?v=4"></script>\n'
 CSS_LINK = '    <link rel="stylesheet" href="/static/instance_theme.css?v=4">\n'
 
-THEME_TOGGLE = """        <div class="theme-toggle instance-theme-toggle" role="group" aria-label="鐣岄潰涓婚">
-            <button type="button" class="theme-toggle-btn is-active" data-theme-value="dark" aria-pressed="true" title="鏆楄壊涓婚">
+THEME_TOGGLE = """        <div class="theme-toggle instance-theme-toggle" role="group" aria-label="界面主题">
+            <button type="button" class="theme-toggle-btn is-active" data-theme-value="dark" aria-pressed="true" title="暗色主题">
                 <svg class="theme-icon" viewBox="0 0 24 24" width="18" height="18" aria-hidden="true">
                     <path fill="currentColor" d="M12.1 3a9 9 0 1 0 8.9 11 6.5 6.5 0 1 1-8.9-11z"/>
                 </svg>
             </button>
-            <button type="button" class="theme-toggle-btn" data-theme-value="light" aria-pressed="false" title="浜壊涓婚">
+            <button type="button" class="theme-toggle-btn" data-theme-value="light" aria-pressed="false" title="亮色主题">
                 <svg class="theme-icon" viewBox="0 0 24 24" width="18" height="18" aria-hidden="true" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round">
                     <circle cx="12" cy="12" r="4"/><path d="M12 2v2M12 20v2M4.93 4.93l1.41 1.41M17.66 17.66l1.41 1.41M2 12h2M20 12h2M4.93 19.07l1.41-1.41M17.66 6.34l1.41-1.41"/>
                 </svg>
@@ -26,12 +26,12 @@ THEME_TOGGLE = """        <div class="theme-toggle instance-theme-toggle" role="
 """
 
 INDEX_HEADER_OLD = """    <div class="header">
-        <h1>鍔犲瘑璐у竵锝滀氦鏄撶洃鎺?+ AI澶嶇洏涓€浣撳寲</h1>
+        <h1>加密货币｜交易监控 + AI复盘一体化</h1>
         <div class="exchange-tag">{{ exchange_display }}</div>
     </div>"""
 
 INDEX_HEADER_NEW = """    <div class="header">
-        <h1>鍔犲瘑璐у竵锝滀氦鏄撶洃鎺?+ AI澶嶇洏涓€浣撳寲</h1>
+        <h1>加密货币｜交易监控 + AI复盘一体化</h1>
         <div class="header-row">
             <div class="exchange-tag">{{ exchange_display }}</div>
 """ + THEME_TOGGLE + """        </div>