feat: create new structs for application and network configurations

- Add a new file `app.go` in the `app/infra/configx` directory
- Define the `Application` struct with a `Networks` field
- Define the `Network` struct with a `Name` field

Signed-off-by: Sean Zheng <[email protected]>

app/infra/configx/app.go

@@ -0,0 +1,11 @@
+package configx
+
+// Application is the application configuration
+type Application struct {
+	Networks map[string]*Network `json:"networks" yaml:"networks"`
+}
+
+// Network is the network configuration
+type Network struct {
+	Name string `json:"name" yaml:"name"`
+}