finish world initialization, set up init on startup and on shutdown, move all models to main directory

internal/foundry/models/db/foundry_data.go

@@ -0,0 +1,26 @@
+package db
+
+import (
+	"database/sql"
+	"time"
+)
+
+type FoundryDataType string
+
+const (
+	SetupType = FoundryDataType("setup")
+	GameType  = FoundryDataType("game")
+)
+
+type FoundryData struct {
+	ID uint
+
+	Type      FoundryDataType
+	Setup     *Setup
+	Game      *Game
+	CreatedAt time.Time
+}
+
+type FoundryDataModel struct {
+	DB *sql.DB
+}