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>

deploy/sanitize_hub_settings.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-"""重装后清理 hub_settings.json 中已废弃的 gate_bot / 第四账户条目。"""
+"""重装后清理 hub_settings.json 中已废弃的 gate_bot / 第四账户条目."""
 from __future__ import annotations
 
 import json
@@ -92,7 +92,7 @@ def main(argv: list[str] | None = None) -> int:
         for line in removed:
             print(f"  - {line}")
     else:
-        print("无需修改（未发现 gate_bot / 第四账户）")
+        print("无需修改(未发现 gate_bot / 第四账户)")
     return 0