第 0 阶段：项目初始化

backend/internal/database/mysql.go

@@ -0,0 +1,10 @@
+package database
+
+import (
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+)
+
+func OpenMySQL(dsn string) (*gorm.DB, error) {
+	return gorm.Open(mysql.Open(dsn), &gorm.Config{})
+}

backend/internal/database/redis.go

@@ -0,0 +1,25 @@
+package database
+
+import (
+	"context"
+
+	"github.com/redis/go-redis/v9"
+)
+
+type RedisConfig struct {
+	Addr     string
+	Password string
+	DB       int
+}
+
+func OpenRedis(ctx context.Context, cfg RedisConfig) (*redis.Client, error) {
+	client := redis.NewClient(&redis.Options{
+		Addr:     cfg.Addr,
+		Password: cfg.Password,
+		DB:       cfg.DB,
+	})
+	if err := client.Ping(ctx).Err(); err != nil {
+		return nil, err
+	}
+	return client, nil
+}