refactor: remove unused echo listener and hello tool; add HelloCommand in test_plugin

src/handlers/listeners/echo.py

@@ -1,12 +0,0 @@
-from astrbot_sdk.api.components. import ListenerComponent
-from astrbot.api.v1.event import AstrMessageEvent, filter
-from astrbot.api.v1.context import Context
-
-
-class EchoListener(ListenerComponent):
-    def __init__(self, context: Context):
-        super().__init__(context)
-
-    @filter.platform_adapter_type(filter.PlatformAdapterType.ALL)
-    async def on_message(self, event: AstrMessageEvent):
-        yield event.plain_result("Hello, Astrbot!")

src/handlers/tools/hello.py

@@ -1,31 +0,0 @@
-from mcp.types import CallToolResult
-from pydantic import Field
-from pydantic.dataclasses import dataclass
-
-from astrbot.api.v1.components.agent.tool import FunctionTool
-from astrbot.api.v1.components.agent import ContextWrapper, AstrAgentContext
-
-
-@dataclass
-class HelloWorldTool(FunctionTool):
-    name: str = "hello_world"  # 工具名称
-    description: str = "Say hello to the world."  # 工具描述
-    parameters: dict = Field(
-        default_factory=lambda: {
-            "type": "object",
-            "properties": {
-                "greeting": {
-                    "type": "string",
-                    "description": "The greeting message.",
-                },
-            },
-            "required": ["greeting"],
-        }
-    )  # 工具参数定义，见 OpenAI 官网或 https://json-schema.org/understanding-json-schema/
-
-    async def call(
-        self, context: ContextWrapper[AstrAgentContext], **kwargs
-    ) -> str | CallToolResult:
-        # event 在 context.context.event 中可用
-        greeting = kwargs.get("greeting", "Hello")
-        return f"{greeting}, World!"  # 也支持 mcp.types.CallToolResult 类型

src/plugin.yaml

@@ -5,7 +5,7 @@ desc: 一个简单的问候插件示例
 author: Soulter
 version: 0.1.0
 components: # 组件列表，将支持自动生成
-  - class: handlers.commands.hello:HelloCommand
+  - class: test_plugin.commands.hello:HelloCommand
     type: command
     name: hello
     description: 发送问候消息