simplify diff

src/server/auth/errors.ts

@@ -189,13 +189,3 @@ export class InsufficientScopeError extends OAuthError {
     super("insufficient_scope", message, errorUri);
   }
 }
-
-/**
- * Invalid target error - The requested resource is invalid, unknown, or malformed.
- * (RFC 8707 - Resource Indicators for OAuth 2.0)
- */
-export class InvalidTargetError extends OAuthError {
-  constructor(message: string, errorUri?: string) {
-    super("invalid_target", message, errorUri);
-  }
-}

src/server/auth/provider.ts

@@ -8,7 +8,7 @@ export type AuthorizationParams = {
   scopes?: string[];
   codeChallenge: string;
   redirectUri: string;
-  resource?: string;
+  resource?: URL;
 };
 
 /**

src/server/auth/types.ts

@@ -26,7 +26,7 @@ export interface AuthInfo {
    * The RFC 8707 resource server identifier for which this token is valid.
    * If set, this MUST match the MCP server's resource identifier (minus hash fragment).
    */
-  resource?: string;
+  resource?: URL;
 
   /**
    * Additional data associated with the token.