Automatically Generate Schemas

[eucyt]

Currently, SDKs such as line-bot-sdk-java automatically generate models and clients from the OpenAPI specification available in line-openapi.

In line-bot-mcp-server, however, the Zod schemas used as tool inputs are currently defined manually.
If we automatically generate these schemas from line-openapi and use them directly, we would no longer need to define them manually, and it would become much easier to keep up with updates to the Messaging API.