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>

manual_trading_hub/settings_store.py

@@ -1,4 +1,4 @@
-"""中控交易所配置（hub_settings.json）。"""
+"""中控交易所配置(hub_settings.json)."""
 
 from __future__ import annotations
 
@@ -72,7 +72,7 @@ def _ids_from_csv(raw: str | None) -> set[str]:
 
 
 def env_force_disabled_ids() -> set[str]:
-    # 未设置时默认不强制关闭任何账户；要用旧行为可设 HUB_DISABLED_IDS=1
+    # 未设置时默认不强制关闭任何账户;要用旧行为可设 HUB_DISABLED_IDS=1
     raw = (os.getenv("HUB_DISABLED_IDS") or "").strip()
     return _ids_from_csv(raw)