feat(05-03): add user-plugin organisations table (structure only)

- create_organisations folds PHP v3.2.0; no users-table ALTER this phase
- Organisation model is an FK target; app.key placeholder in config

updates/organisations_test.go

@@ -0,0 +1,54 @@
+package updates
+
+import (
+	"testing"
+
+	"git.golem15.com/golem15/summercms/lagoon"
+	"github.com/go-gormigrate/gormigrate/v2"
+)
+
+func TestCreateOrganisationsMigration(t *testing.T) {
+	sqlDB := dedicatedDB(t, "user_organisations")
+	gdb, err := lagoon.Use(t.Context(), sqlDB)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	opts := &gormigrate.Options{
+		TableName:      "summer_migrations_golem15_user",
+		UseTransaction: true,
+	}
+	m := gormigrate.New(gdb, opts, All())
+	if err := m.Migrate(); err != nil {
+		t.Fatal(err)
+	}
+	if !gdb.Migrator().HasTable("golem15_user_organisations") {
+		t.Fatal("golem15_user_organisations missing after migrate")
+	}
+	if !gdb.Migrator().HasTable("users") {
+		t.Fatal("users missing after migrate")
+	}
+	for _, col := range []string{"id", "slug", "name", "description", "created_at", "updated_at"} {
+		if !gdb.Migrator().HasColumn("golem15_user_organisations", col) {
+			t.Fatalf("missing column %s", col)
+		}
+	}
+
+	var ids []string
+	if err := gdb.Raw(`SELECT id FROM summer_migrations_golem15_user ORDER BY id`).Scan(&ids).Error; err != nil {
+		t.Fatal(err)
+	}
+	if len(ids) != 2 || ids[1] != "202609180002_create_organisations" {
+		t.Fatalf("history = %v", ids)
+	}
+
+	if err := m.RollbackLast(); err != nil {
+		t.Fatal(err)
+	}
+	if gdb.Migrator().HasTable("golem15_user_organisations") {
+		t.Fatal("rollback must drop golem15_user_organisations")
+	}
+	if !gdb.Migrator().HasTable("users") {
+		t.Fatal("users must survive organisations rollback")
+	}
+}