fix: align rustfmt formatting with CI stable toolchain

Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

Author: its-mash

crates/mcpmux-gateway/src/mcp/handler.rs

@@ -29,10 +29,7 @@ pub struct McpMuxGatewayHandler {
 }
 
 impl McpMuxGatewayHandler {
-    pub fn new(
-        services: Arc<ServiceContainer>,
-        notification_bridge: Arc<MCPNotifier>,
-    ) -> Self {
+    pub fn new(services: Arc<ServiceContainer>, notification_bridge: Arc<MCPNotifier>) -> Self {
         Self {
             services,
             notification_bridge,

crates/mcpmux-gateway/src/server/mod.rs

@@ -238,10 +238,8 @@ impl GatewayServer {
         }
 
         // Create MCP handler
-        let handler = McpMuxGatewayHandler::new(
-            Arc::new(self.services.clone()),
-            notification_bridge.clone(),
-        );
+        let handler =
+            McpMuxGatewayHandler::new(Arc::new(self.services.clone()), notification_bridge.clone());
 
         // Create STATEFUL MCP service (full Streamable HTTP per spec 2025-11-25)
         // stateful_mode: true means: