feat(05-01): restructure fonoteka plugins into Winter directories

- Move models, classes, controllers, middleware, and updates into subpackages
- Add self-registering models/updates/classes registries so later plans add files
- Keep the genres route and shipped migration SQL unchanged

updates/00_base.go

@@ -0,0 +1,33 @@
+package updates
+
+import (
+	"github.com/go-gormigrate/gormigrate/v2"
+	"gorm.io/gorm"
+)
+
+// Folds PHP updates/v1.0.1/create_users_table.php and
+// updates/v3.2.1/add_must_change_password_to_users.php into the minimal
+// columns the first vertical slice reads.
+var migrations = []*gormigrate.Migration{
+	{
+		ID: "202609170001_create_users",
+		Migrate: func(tx *gorm.DB) error {
+			return tx.Exec(`
+CREATE TABLE users (
+	id SERIAL PRIMARY KEY,
+	email TEXT NOT NULL UNIQUE,
+	password TEXT NOT NULL DEFAULT '',
+	must_change_password BOOLEAN NOT NULL DEFAULT FALSE,
+	created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+	updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+)`).Error
+		},
+		Rollback: func(tx *gorm.DB) error {
+			return tx.Exec(`DROP TABLE IF EXISTS users`).Error
+		},
+	},
+}
+
+func init() {
+	Register(migrations...)
+}

updates/registry.go

@@ -0,0 +1,15 @@
+package updates
+
+import "github.com/go-gormigrate/gormigrate/v2"
+
+var all []*gormigrate.Migration
+
+// Register appends gormigrate steps so later plans add files without editing plugin.go.
+func Register(ms ...*gormigrate.Migration) {
+	all = append(all, ms...)
+}
+
+// All returns every migration registered by this plugin's updates package.
+func All() []*gormigrate.Migration {
+	return all
+}