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/common/static/instance_embed.js

@@ -1,6 +1,6 @@
 /**
- * 中控 iframe 壳：顶栏/统计常驻，tab 内容走 /api/embed/page/<tab>。
- * 各 tab 面板常驻 DOM，切换时 show/hide；脚本延后到首次激活，回访零请求。
+ * 中控 iframe 壳:顶栏/统计常驻,tab 内容走 /api/embed/page/<tab>.
+ * 各 tab 面板常驻 DOM,切换时 show/hide;脚本延后到首次激活,回访零请求.
  */
 (function (global) {
   const TAB_PATH = {
@@ -22,7 +22,7 @@
   const tabPanes = new Map();
   const tabBooted = new Set();
 
-  /** 自带校验后 form.submit() 的表单，勿在捕获阶段再 fetch 一份（会双发 POST） */
+  /** 自带校验后 form.submit() 的表单,勿在捕获阶段再 fetch 一份(会双发 POST) */
   const CUSTOM_SUBMIT_FORM_IDS = new Set(["add-order-form", "key-form", "roll-form"]);
 
   function isEmbedShell() {
@@ -234,7 +234,7 @@
     });
     const ct = (r.headers.get("content-type") || "").toLowerCase();
     if (!ct.includes("application/json")) {
-      throw new Error("加载失败（HTTP " + r.status + "）");
+      throw new Error("加载失败(HTTP " + r.status + ")");
     }
     const j = await r.json();
     if (!j.ok || !j.html) throw new Error(j.msg || "加载失败");