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/trade/time_close_lib.py

@@ -1,4 +1,4 @@
-"""持仓时间平仓：开仓后按 1h/2h/4h 定时市价平仓。"""
+"""持仓时间平仓:开仓后按 1h/2h/4h 定时市价平仓."""
 from __future__ import annotations
 
 import time
@@ -47,7 +47,7 @@ def _row_val(row: Any, key: str, default=None):
 
 
 def time_close_settings_from_row(row: Any) -> tuple[int, Optional[int], Optional[int]]:
-    """返回 (enabled, hours, close_at_ms)。"""
+    """返回 (enabled, hours, close_at_ms)."""
     enabled = int(_row_val(row, "time_close_enabled", 0) or 0) != 0
     hours = normalize_time_close_hours(_row_val(row, "time_close_hours"))
     close_at = _row_val(row, "time_close_at_ms")