DB optimization: pool, golang-migrate, consolidate to single Postgres

- Fix DB_NAME=db_yal -> mydb in api_yal .env
- Add connection pool (MaxOpenConns 25, MaxIdleConns 10, ConnMaxLifetime 30m)
- Replace GORM AutoMigrate with golang-migrate in api_yal and api_bb
- Create embedded SQL migrations for both APIs
- Add DB_SCHEMA support to api_bb config
- Consolidate to single Postgres: db_bb -> schema 'bb' on db container
- Remove db_bb service, bb-network, db_bb volume from compose
- Remove api_tp targets from Makefile
- Clean up old migrate.go

main_dc/BB/api_bb/internal/app/app.go

@@ -32,7 +32,8 @@ func (a *App) Initialize() error {
 
 	// Инициализация базы данных
 	dbConfig := &database.Config{
-		URL: a.cfg.DatabaseURL,
+		URL:    a.cfg.DatabaseURL,
+		Schema: a.cfg.DBSchema,
 	}
 	a.db = database.NewDatabase(dbConfig)
 
@@ -46,11 +47,6 @@ func (a *App) Initialize() error {
 		return err
 	}
 
-	// Выполнение миграций
-	if err := a.db.Migrate(); err != nil {
-		return err
-	}
-
 	// Настройка роутера
 	router := routes.SetupRouter(a.db.DB, a.cfg)