fix(decision): add CJK punctuation support in fixMissingQuotes

Critical discovery: AI can output different types of "fullwidth" brackets:
- Fullwidth: ［］｛｝(U+FF3B/FF3D/FF5B/FF5D) ← Already handled
- CJK: 【】〔〕(U+3010/3011/3014/3015) ← Was missing!

Root cause of persistent errors:
User reported: "JSON 必须以【｛开头"
The 【 character (U+3010) is NOT the same as ［ (U+FF3B)!

Added CJK punctuation replacements:
- 【 → [ (U+3010 Left Black Lenticular Bracket)
- 】 → ] (U+3011 Right Black Lenticular Bracket)
- 〔 → [ (U+3014 Left Tortoise Shell Bracket)
- 〕 → ] (U+3015 Right Tortoise Shell Bracket)
- 、 → , (U+3001 Ideographic Comma)

Why this was missed:
AI uses different characters in different contexts. CJK brackets (U+3010-3017)
are distinct from Fullwidth Forms (U+FF00-FFEF) in Unicode.

Test case:
Input:  【｛"symbol"："BTCUSDT"】
Output: [{"symbol":"BTCUSDT"}]

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

decision/engine.go

@@ -550,6 +550,13 @@ func fixMissingQuotes(jsonStr string) string {
 	jsonStr = strings.ReplaceAll(jsonStr, "：", ":") // 全角冒号 U+FF1A
 	jsonStr = strings.ReplaceAll(jsonStr, "，", ",") // 全角逗号 U+FF0C
 
+	// ⚠️ 替换CJK标点符号（AI在中文上下文中也可能输出这些）
+	jsonStr = strings.ReplaceAll(jsonStr, "【", "[") // CJK左方头括号 U+3010
+	jsonStr = strings.ReplaceAll(jsonStr, "】", "]") // CJK右方头括号 U+3011
+	jsonStr = strings.ReplaceAll(jsonStr, "〔", "[") // CJK左龟壳括号 U+3014
+	jsonStr = strings.ReplaceAll(jsonStr, "〕", "]") // CJK右龟壳括号 U+3015
+	jsonStr = strings.ReplaceAll(jsonStr, "、", ",") // CJK顿号 U+3001
+
 	return jsonStr
 }