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/trade_stats_calendar_lib.py

@@ -1,4 +1,4 @@
-"""按交易日聚合实例 trade_records 盈亏，供统计分析页日历 API 使用。"""
+"""按交易日聚合实例 trade_records 盈亏,供统计分析页日历 API 使用."""
 from __future__ import annotations
 
 import json
@@ -15,7 +15,7 @@ def build_trade_stats_calendar(
     *,
     reset_hour: int = 8,
 ) -> dict[str, Any]:
-    """pnls: _load_completed_trade_pnls 返回值 (pnl, close_dt, trading_day, row)。"""
+    """pnls: _load_completed_trade_pnls 返回值 (pnl, close_dt, trading_day, row)."""
     y = int(year)
     m = int(month)
     if m < 1 or m > 12:
@@ -82,7 +82,7 @@ def build_initial_stats_calendar(
     reset_hour: int = 8,
     segment_key: str = "all",
 ) -> dict[str, Any]:
-    """统计页首屏内嵌日历（当前自然月、默认品类）。"""
+    """统计页首屏内嵌日历(当前自然月,默认品类)."""
     return build_trade_stats_calendar(
         pnls,
         now_dt.year,
@@ -101,7 +101,7 @@ def build_stats_calendar_bootstrap(
     reset_hour: int = 8,
     segment_key: str = "all",
 ) -> tuple[dict[str, Any] | None, str | None]:
-    """返回 (payload, json_str)；失败时 (None, None)，供模板安全内嵌。"""
+    """返回 (payload, json_str);失败时 (None, None),供模板安全内嵌."""
     try:
         payload = build_initial_stats_calendar(
             pnls,