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/scripts/check_agents.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# 检查三路子代理端口与 /status（在服务器上运行）
+# 检查三路子代理端口与 /status(在服务器上运行)
 set -e
 
 check_one() {
@@ -11,17 +11,17 @@ check_one() {
   if command -v curl >/dev/null 2>&1; then
     local body
     body=$(curl -sf --max-time 8 "http://127.0.0.1:${port}/status" 2>/dev/null) || {
-      echo "  /status: 无法连接（agent 未启动或崩溃）"
+      echo "  /status: 无法连接(agent 未启动或崩溃)"
       return
     }
     echo "  /status: ${body:0:200}"
     if echo "${body}" | grep -q '"ok":true'; then
       echo "  结果: OK"
     else
-      echo "  结果: ok=false，见上 JSON"
+      echo "  结果: ok=false,见上 JSON"
     fi
   else
-    echo "  (未安装 curl，跳过 HTTP 检测)"
+    echo "  (未安装 curl,跳过 HTTP 检测)"
   fi
   echo
 }