feat: add client-metadata.json

Add client metadata file for SEP-991 CIMD
authentication support

Signed-off-by: tanish111 <[email protected]>

Author: tanish111

client-metadata.json

@@ -0,0 +1,7 @@
+{
+  "client_id": "https://raw.githubusercontent.com/modelcontextprotocol/rust-sdk/refs/heads/main/client-metadata.json",
+  "redirect_uris": ["http://localhost:4000/callback"],
+  "grant_types": ["authorization_code"],
+  "response_types": ["code"],
+  "token_endpoint_auth_method": "none"
+}

examples/clients/src/auth/oauth_client.rs

@@ -27,7 +27,7 @@ const MCP_SERVER_URL: &str = "http://127.0.0.1:3000/mcp";
 const MCP_REDIRECT_URI: &str = "http://127.0.0.1:8080/callback";
 const CALLBACK_PORT: u16 = 8080;
 const CALLBACK_HTML: &str = include_str!("callback.html");
-const CLIENT_METADATA_URL: &str = "https://raw.githubusercontent.com/tanish111/cimd-local-oauth-server/refs/heads/main/client-metadata.json";
+const CLIENT_METADATA_URL: &str = "https://raw.githubusercontent.com/modelcontextprotocol/rust-sdk/refs/heads/main/client-metadata.json";
 
 #[derive(Clone)]
 struct AppState {