refactor: improve code readability and consistency across multiple files

apps/infrastructure/src/mcp/manager.rs

@@ -22,6 +22,15 @@ impl McpManager {
             servers: HashMap::new(),
         }
     }
+}
+
+impl Default for McpManager {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl McpManager {
 
     pub fn register(&mut self, name: &str, transport: &str) {
         self.servers.insert(