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/exchange/gate_ccxt_lib.py

@@ -1,9 +1,9 @@
-"""Gate.io ccxt 构造（ccxt 4.x 起类名由 gateio 改为 gate）。"""
-from __future__ import annotations
-
-import ccxt
-
-
-def gate_ccxt_class():
-    """返回 ccxt Gate 交易所类（兼容旧版 gateio 名称）。"""
-    return getattr(ccxt, "gate", None) or ccxt.gateio
+"""Gate.io ccxt 构造(ccxt 4.x 起类名由 gateio 改为 gate)."""
+from __future__ import annotations
+
+import ccxt
+
+
+def gate_ccxt_class():
+    """返回 ccxt Gate 交易所类(兼容旧版 gateio 名称)."""
+    return getattr(ccxt, "gate", None) or ccxt.gateio