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_okx.py

@@ -1,4 +1,4 @@
-"""OKX 永续 — 策略交易交易所适配（见 strategy_config.build_strategy_config）。"""
-from lib.strategy.strategy_exchange_base import StrategyExchangeAdapter
-
-__all__ = ["StrategyExchangeAdapter"]
+"""OKX 永续 — 策略交易交易所适配(见 strategy_config.build_strategy_config)."""
+from lib.strategy.strategy_exchange_base import StrategyExchangeAdapter
+
+__all__ = ["StrategyExchangeAdapter"]