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/instance_settings_lib.py

@@ -1,4 +1,4 @@
-"""实例「系统设置」页：从 .env 汇总风控说明（三所共用）。"""
+"""实例「系统设置」页:从 .env 汇总风控说明(三所共用)."""
 from __future__ import annotations
 
 import os
@@ -82,7 +82,7 @@ def build_instance_settings_view(
                 _row(
                     "单日开仓提醒",
                     f"第 {alert_threshold} 次",
-                    "达次数推送企业微信，不拦单",
+                    "达次数推送企业微信,不拦单",
                 ),
                 _row(
                     "单日开仓硬上限",
@@ -144,7 +144,7 @@ def build_instance_settings_view(
                     _row("期权模块", "已启用"),
                     _row(
                         "期权 API",
-                        f"已配置（…{opt_key[-4:]}）" if len(opt_key) >= 4 else "未配置",
+                        f"已配置(…{opt_key[-4:]})" if len(opt_key) >= 4 else "未配置",
                     ),
                     _row(
                         "子账户",