Refactor configuration and enhance AI capabilities

Updated .env.example to improve clarity and added new configuration options for memory and reliability settings. Refactored main.py to streamline the bot's entry point and improved error handling. Enhanced README to reflect new features and command structure. Removed deprecated cmd_zip_skill and skills_creator modules to clean up the codebase. Updated AIClient and MemorySystem for better performance and flexibility in handling user interactions.

.env.example

@@ -1,36 +1,36 @@
-# QQ 机器人配置
-# 可从 https://bot.q.qq.com/open 获取
-
-# 机器人 AppID（必填）
+# QQ Bot credentials
 BOT_APPID=your_app_id_here
-
-# 机器人 AppSecret（必填）
 BOT_SECRET=your_app_secret_here
 
-# 日志级别: DEBUG / INFO / WARNING / ERROR
+# Runtime
+APP_ENV=dev
 LOG_LEVEL=INFO
-
-# 是否启用沙箱环境
+LOG_FORMAT=text
 SANDBOX_MODE=False
 
-# ==================== AI 配置 ====================
+# Optional admin allow-list (comma separated user IDs).
+# Empty means all users are treated as admin.
+BOT_ADMIN_IDS=
 
-# 主模型配置
-# 可选 provider: openai / anthropic / deepseek / qwen
+# AI chat model
 AI_PROVIDER=openai
 AI_MODEL=gpt-4
 AI_API_KEY=your_api_key_here
-# 可选，自定义 API 地址
 AI_API_BASE=https://api.openai.com/v1
 
-# 嵌入模型配置（用于长期记忆检索）
-# 不配置时将回退为主模型的 embedding 能力（如果可用）
+# Embedding model (optional)
 AI_EMBED_PROVIDER=openai
 AI_EMBED_MODEL=text-embedding-3-small
 AI_EMBED_API_KEY=
 AI_EMBED_API_BASE=
 
-# 向量数据库配置
-# true: 使用 Chroma（推荐）
-# false: 使用 JSON 存储
+# Memory storage and retrieval
 AI_USE_VECTOR_DB=true
+AI_USE_QUERY_EMBEDDING=false
+AI_MEMORY_SCOPE=session
+
+# Reliability
+AI_CHAT_RETRIES=1
+AI_CHAT_RETRY_BACKOFF_SECONDS=0.8
+MESSAGE_DEDUP_SECONDS=30
+MESSAGE_DEDUP_MAX_SIZE=4096