add db models, refactor json models, add references in migrations

internal/foundry/models/json/status.go

@@ -0,0 +1,11 @@
+package json
+
+type Status struct {
+	Active        bool   `json:"active"`
+	Version       string `json:"version"`
+	World         string `json:"world,omitempty"`
+	System        string `json:"system,omitempty"`
+	SystemVersion string `json:"systemVersion,omitempty"`
+	Users         int    `json:"users,omitempty"`
+	Uptime        int64  `json:"uptime,omitempty"`
+}