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/strategy/strategy_exchange_base.py

@@ -1,4 +1,4 @@
-"""交易所策略适配器接口（各所 app 注入 ccxt 实现）。"""
+"""交易所策略适配器接口(各所 app 注入 ccxt 实现)."""
 from __future__ import annotations
 
 from typing import Any, Optional, Protocol
@@ -14,7 +14,7 @@ class StrategyExchangeAdapter(Protocol):
     def get_mark_price(self, symbol: str) -> Optional[float]: ...
 
     def get_position(self, exchange_symbol: str, direction: str) -> dict[str, Any]:
-        """返回 {contracts, entry_price, leverage?}。"""
+        """返回 {contracts, entry_price, leverage?}."""
         ...
 
     def amount_to_precision(self, exchange_symbol: str, amount: float) -> Optional[float]: ...