优化 ai_auto_response 拟人化短回复并统一走 Dify 链路

- 移除普通 chat 调用分支，统一通过 Dify 请求生成回复
- 收紧小牛人格描述，强化短句、熟人感和非客服式表达
- 新增提示策略，按场景启用成员记忆/群事实/向量记忆，降低记忆压迫感
- 下调回复长度与上下文压缩配置，使默认回复更接近 10 字级别
- 通过 compileall 验证 ai_auto_response 插件语法可用

plugins/ai_auto_response/config.toml

@@ -55,30 +55,30 @@ memory_lookback_days = 180
 active_context_hours = 8
 
 [reply]
-social_short_char_limit = 30
-social_short_total_limit = 30
-qa_fast_char_limit = 34
-qa_fast_total_limit = 34
+social_short_char_limit = 12
+social_short_total_limit = 12
+qa_fast_char_limit = 18
+qa_fast_total_limit = 18
 qa_with_context_sentence_limit = 2
 qa_with_context_chunk_limit = 2
-qa_with_context_char_limit = 32
-qa_with_context_total_limit = 55
-default_char_limit = 28
-default_total_limit = 28
+qa_with_context_char_limit = 16
+qa_with_context_total_limit = 28
+default_char_limit = 12
+default_total_limit = 12
 
 [prompt_compact]
-group_profile_max_chars = 560
-group_profile_max_lines = 10
-context_max_chars = 900
-context_max_lines = 18
-recent_message_max_lines = 8
+group_profile_max_chars = 220
+group_profile_max_lines = 6
+context_max_chars = 360
+context_max_lines = 10
+recent_message_max_lines = 4
 recent_message_line_max_chars = 60
-at_member_profile_max_chars = 300
-at_member_profile_max_lines = 8
-member_memory_max_chars = 520
-member_memory_max_lines = 12
-memory_max_chars = 900
-memory_max_lines = 18
+at_member_profile_max_chars = 160
+at_member_profile_max_lines = 5
+member_memory_max_chars = 180
+member_memory_max_lines = 6
+memory_max_chars = 240
+memory_max_lines = 8
 strict_memory_relevance = true
 
 [image]