fix: 移除命令拦截逻辑，允许所有消息传给 Agent 处理

- handler.py: 删除 `/` 开头命令拦截，支持 Agent Skill 调用
- .gitignore: 移除通配符规则，保留 samconfig.toml.example

Author: BukeLy

.gitignore

@@ -17,4 +17,3 @@ agent-sdk-server/claude-settings.json
 
 # Sensitive configuration files
 samconfig.toml
-samconfig*.toml

agent-sdk-client/handler.py

@@ -39,14 +39,6 @@ async def process_webhook(body: dict) -> None:
     if not message or not message.text:
         return
 
-    if message.text.startswith('/'):
-        await bot.send_message(
-            chat_id=message.chat_id,
-            text="Commands not supported yet. Just send me a message!",
-            message_thread_id=message.message_thread_id,
-        )
-        return
-
     await bot.send_chat_action(
         chat_id=message.chat_id,
         action=ChatAction.TYPING,