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/chart_draw.js

@@ -1,5 +1,5 @@
 /**
- * 行情区左侧画线工具（canvas 叠加层，坐标与 Lightweight Charts 对齐）。
+ * 行情区左侧画线工具(canvas 叠加层,坐标与 Lightweight Charts 对齐).
  */
 (function () {
   const STORAGE_PREFIX = "hubMarketDraw:";
@@ -1276,7 +1276,7 @@
   function setActiveTool(tool) {
     if (!TOOL_LABELS[tool]) return;
     if (tool === "clear") {
-      if (drawings.length && window.confirm("清除当前图表上的全部画线？")) {
+      if (drawings.length && window.confirm("清除当前图表上的全部画线?")) {
         drawings = [];
         selectedId = null;
         draft = null;