fix(services): Fix service startup failures

- Remove duplicate CoreModule() calls from all service main.go files
  - NewContainer() already includes CoreModule() automatically
  - This was causing duplicate ConfigProvider provider errors

- Update all _fx.go files to use *database.Client instead of *ent.Client
  - database.Client embeds *ent.Client, so it can be used directly
  - This fixes type mismatches between providers and consumers
  - Keep ent import for constants like ent.Desc

- All services now build and should start successfully

cmd/auth-service/auth_service_fx.go

@@ -12,7 +12,7 @@ import (
 	"time"
 
 	authv1 "git.dcentral.systems/toolz/goplt/api/proto/generated/auth/v1"
-	"git.dcentral.systems/toolz/goplt/internal/ent"
+	"git.dcentral.systems/toolz/goplt/internal/infra/database"
 	"git.dcentral.systems/toolz/goplt/pkg/config"
 	"git.dcentral.systems/toolz/goplt/pkg/logger"
 	"git.dcentral.systems/toolz/goplt/pkg/services"
@@ -34,7 +34,7 @@ const (
 
 // authService provides authentication functionality.
 type authService struct {
-	client             *ent.Client
+	client             *database.Client
 	logger             logger.Logger
 	identityClient     services.IdentityServiceClient
 	jwtSecret          []byte
@@ -303,7 +303,7 @@ func provideAuthService() fx.Option {
 	return fx.Options(
 		// Auth service
 		fx.Provide(func(
-			client *ent.Client,
+			client *database.Client,
 			log logger.Logger,
 			identityClient services.IdentityServiceClient,
 			cfg config.ConfigProvider,

cmd/auth-service/main.go

@@ -81,10 +81,8 @@ func (s *grpcServerWrapper) Port() int {
 
 func main() {
 	// Create DI container
+	// Note: CoreModule() is automatically included by NewContainer()
 	container := di.NewContainer(
-		// Core kernel services
-		di.CoreModule(),
-
 		// Database for auth service (auth schema)
 		fx.Provide(func(cfg config.ConfigProvider, log logger.Logger) (*database.Client, error) {
 			dsn := cfg.GetString("database.dsn")