feat(ai_auto_response): add admin-controlled persona switching

plugins/ai_auto_response/config.toml

@@ -1,6 +1,7 @@
 enable = true
 
 [persona]
+active_persona = "xiaoniu"
 name = "小牛"
 persona_file = "persona/xiaoniu.txt"
 style = "自然、口语化、像群友，技术宅气质明显，先回答问题，再决定是否延伸"
@@ -8,6 +9,30 @@ emoji_probability = 0.18
 max_reply_sentences = 3
 familiarity_hint = "有熟悉感，但不过度装熟"
 
+[persona.presets.xiaoniu]
+name = "小牛"
+persona_file = "persona/xiaoniu.txt"
+style = "自然、口语化、像群友，技术宅气质明显，先回答问题，再决定是否延伸"
+max_reply_sentences = 3
+familiarity_hint = "有熟悉感，但不过度装熟"
+aliases = ["小牛", "xiaoniu", "默认"]
+
+[persona.presets.yuqian]
+name = "于谦"
+persona_file = "persona/yuqian_sharp.txt"
+style = "嘴损一点，但不是纯攻击；懒散、老油条、毒舌里带点幽默"
+max_reply_sentences = 3
+familiarity_hint = "熟人式损两句，但别真伤人"
+aliases = ["于谦", "yuqian", "毒舌", "毒舌版"]
+
+[persona.presets.lingzhiling]
+name = "林志玲"
+persona_file = "persona/lingzhiling_gentle.txt"
+style = "温柔、从容、体贴，措辞柔和但不肉麻"
+max_reply_sentences = 3
+familiarity_hint = "有亲和力，但不越界装熟"
+aliases = ["林志玲", "lingzhiling", "温柔", "温柔版"]
+
 [api]
 backend = "openai_compatible_ai_auto_response"
 
@@ -112,6 +137,7 @@ debug = true
 
 [group_profiles.default]
 mode = "social"
+persona_id = "xiaoniu"
 knowledge_domain = "general"
 knowledge_focus = ["群当前话题", "日常闲聊", "通用技术常识"]
 reply_style = "自然、克制、短句"
@@ -124,6 +150,7 @@ persona_overlay = "小牛默认是技术宅，但在普通闲聊群不端着，
 
 [[group_profiles.profiles]]
 mode = "robotics"
+persona_id = "xiaoniu"
 group_name_keywords = ["机器人", "bot", "wechat", "微信机器人", "自动化"]
 knowledge_domain = "robotics"
 knowledge_focus = ["微信机器人", "插件机制", "消息路由", "自动化脚本", "部署与调试"]
@@ -137,6 +164,7 @@ persona_overlay = "这里是机器人相关群，小牛可以优先从机器人
 
 [[group_profiles.profiles]]
 mode = "openclaw"
+persona_id = "xiaoniu"
 group_name_keywords = ["openclaw","龙虾","🦞"]
 knowledge_domain = "openclaw"
 knowledge_focus = ["OpenClaw架构", "OpenClaw接入", "配置排查", "运行问题", "接口联调"]
@@ -150,6 +178,7 @@ persona_overlay = "这里是 OpenClaw 群，小牛理解技术问题时可以把
 
 [[group_profiles.profiles]]
 mode = "social"
+persona_id = "xiaoniu"
 group_name_keywords = ["闲聊", "唠嗑", "水群","养生"]
 knowledge_domain = "casual"
 knowledge_focus = ["群当前话题", "轻松闲聊"]
@@ -163,6 +192,7 @@ persona_overlay = "这里偏闲聊，小牛可以轻松一点，但仍然少说
 
 [[group_profiles.profiles]]
 mode = "dota"
+persona_id = "xiaoniu"
 group_name_keywords = ["dota", "dota2", "刀塔","强神"]
 knowledge_domain = "dota"
 knowledge_focus = ["Dota英雄", "对线理解", "出装节奏", "团战思路", "版本常识"]