MCP endpoint

Model Context Protocol (MCP) server over a stateless Streamable HTTP transport. Point an MCP client at this URL to use unicum.gg's read API as MCP tools (the same player, clan and tank data as the REST endpoints). The POST body is a JSON-RPC 2.0 message (initialize, tools/list, tools/call, ...); the server replies with a JSON-RPC response or, when streaming, an SSE stream. GET opens the SSE stream and DELETE ends a session (transport-level, not documented separately).