Use Last-Event-ID instead of last-event-id

see https://html.spec.whatwg.org/multipage/server-sent-events.html#the-last-event-id-header

Signed-off-by: Yanming Zhou <[email protected]>

Author: quaff

mcp/src/main/java/io/modelcontextprotocol/spec/HttpHeaders.java

@@ -19,7 +19,7 @@ public interface HttpHeaders {
 	/**
 	 * Identifies events within an SSE Stream.
 	 */
-	String LAST_EVENT_ID = "last-event-id";
+	String LAST_EVENT_ID = "Last-Event-ID";
 
 	/**
 	 * Identifies the MCP protocol version.