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>

manual_trading_hub/static/strategy.js

@@ -1,5 +1,5 @@
 /**
- * 策略说明：三所 MD + 开仓检查清单 JSON。
+ * 策略说明:三所 MD + 开仓检查清单 JSON.
  */
 (function () {
   const page = document.getElementById("page-strategy");
@@ -109,7 +109,7 @@
     if (docBody) docBody.innerHTML = data.strategy_html || "";
     if (docSource) {
       const ver = data.version ? ` · ${data.version}` : "";
-      docSource.textContent = `文档：${data.md_source || ""}${ver}`;
+      docSource.textContent = `文档:${data.md_source || ""}${ver}`;
     }
     renderChecklist(data.checklist);
     scheduleHeightSync();