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/hub/hub_host_status_lib.py

@@ -1,4 +1,4 @@
-"""中控：本机 CPU / 内存 / 磁盘 / 网络快照（监控区服务器状态条）。"""
+"""中控:本机 CPU / 内存 / 磁盘 / 网络快照(监控区服务器状态条)."""
 from __future__ import annotations
 
 import os
@@ -37,7 +37,7 @@ def get_host_status() -> dict[str, Any]:
     except ImportError:
         return {
             "ok": False,
-            "msg": "未安装 psutil，请在 manual-trading-hub 环境执行 pip install psutil",
+            "msg": "未安装 psutil,请在 manual-trading-hub 环境执行 pip install psutil",
         }
 
     now = time.time()