Add unit tests for player configurations and referral system

- Implement tests for player configuration creation, update, and deletion, ensuring proper handling of free and paid user scenarios.
- Add tests for referral registration, including valid and invalid referrer cases.
- Create tests for referral reward flow, verifying correct reward distribution and eligibility.
- Establish a test database setup with necessary schema for user, plan, payment, and notification models.
- Introduce helper functions for seeding test data and loading entities from the database.

cmd/server/main.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"context"
+	"log"
+	"net"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"stream.api/internal/adapters/redis"
+	"stream.api/internal/config"
+	"stream.api/internal/database/query"
+	"stream.api/internal/transport/grpc"
+	"stream.api/pkg/database"
+	"stream.api/pkg/logger"
+)
+
+func main() {
+	// 1. Load Config
+	cfg, err := config.LoadConfig()
+	if err != nil {
+		// Use default if env/file issues, usually LoadConfig returns error only on serious issues
+		// But here if it returns error we might want to panic
+		log.Fatalf("Failed to load config: %v", err)
+	}
+
+	// 2. Connect DB
+	db, err := database.Connect(cfg.Database.DSN)
+	if err != nil {
+		log.Fatalf("Failed to connect to database: %v", err)
+	}
+	// Initialize generated query
+	query.SetDefault(db)
+
+	// TODO: Tách database migration ra luồng riêng nếu cần.
+
+	// 3. Connect Redis (Cache Interface)
+	rdb, err := redis.NewAdapter(cfg.Redis.Addr, cfg.Redis.Password, cfg.Redis.DB)
+	if err != nil {
+		log.Fatalf("Failed to connect to redis: %v", err)
+	}
+	defer rdb.Close() // Ensure we close cache on exit
+
+	// 4. Initialize Components
+	appLogger := logger.NewLogger(cfg.Server.Mode)
+
+	module, err := grpc.NewGRPCModule(context.Background(), cfg, db, rdb, appLogger)
+	if err != nil {
+		log.Fatalf("Failed to setup gRPC runtime module: %v", err)
+	}
+
+	grpcListener, err := net.Listen("tcp", ":"+cfg.Server.GRPCPort)
+	if err != nil {
+		log.Fatalf("Failed to listen on gRPC port %s: %v", cfg.Server.GRPCPort, err)
+	}
+
+	go func() {
+		log.Printf("Starting gRPC server on port %s", cfg.Server.GRPCPort)
+		if err := module.ServeGRPC(grpcListener); err != nil {
+			log.Fatalf("Failed to run gRPC server: %v", err)
+		}
+	}()
+
+	quit := make(chan os.Signal, 1)
+	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
+	<-quit
+	log.Println("Shutting down gRPC server...")
+
+	module.Shutdown()
+	_ = grpcListener.Close()
+
+	log.Println("Server exiting")
+}