refactor: 移除 infrastructure 目录 (#108)

* refactor: 迁移初始化 db 和 redis 到 repository

* refactor: 迁移 errors 到 pkg

backend/internal/repository/redis_test.go

@@ -0,0 +1,35 @@
+package repository
+
+import (
+	"testing"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/config"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBuildRedisOptions(t *testing.T) {
+	cfg := &config.Config{
+		Redis: config.RedisConfig{
+			Host:                "localhost",
+			Port:                6379,
+			Password:            "secret",
+			DB:                  2,
+			DialTimeoutSeconds:  5,
+			ReadTimeoutSeconds:  3,
+			WriteTimeoutSeconds: 4,
+			PoolSize:            100,
+			MinIdleConns:        10,
+		},
+	}
+
+	opts := buildRedisOptions(cfg)
+	require.Equal(t, "localhost:6379", opts.Addr)
+	require.Equal(t, "secret", opts.Password)
+	require.Equal(t, 2, opts.DB)
+	require.Equal(t, 5*time.Second, opts.DialTimeout)
+	require.Equal(t, 3*time.Second, opts.ReadTimeout)
+	require.Equal(t, 4*time.Second, opts.WriteTimeout)
+	require.Equal(t, 100, opts.PoolSize)
+	require.Equal(t, 10, opts.MinIdleConns)
+}