feat: 算力引擎 Go 后端核心（new-api）

- 统一 OpenAI 兼容 /v1 中继 + 渠道/额度/令牌/流水
- 各领域包：relay 模型网关、model 数据层、controller 管理 API

relay/channel/task/sora/adaptor_test.go

@@ -0,0 +1,41 @@
+package sora
+
+import (
+	"bytes"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/QuantumNous/new-api/common"
+	relaycommon "github.com/QuantumNous/new-api/relay/common"
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSoraBuildRequestBodyReturnsReplayablePassThroughBody(t *testing.T) {
+	payload := []byte("opaque-sora-request-body")
+	c, _ := gin.CreateTestContext(httptest.NewRecorder())
+	c.Request = httptest.NewRequest(http.MethodPost, "/v1/videos", bytes.NewReader(payload))
+	c.Request.Header.Set("Content-Type", "application/octet-stream")
+	defer common.CleanupBodyStorage(c)
+
+	info := &relaycommon.RelayInfo{}
+	body, err := (&TaskAdaptor{}).BuildRequestBody(c, info)
+	require.NoError(t, err)
+	replayable, ok := body.(common.ReplayableBody)
+	require.True(t, ok)
+
+	sent, err := io.ReadAll(body)
+	require.NoError(t, err)
+	assert.Equal(t, payload, sent)
+	assert.EqualValues(t, len(payload), replayable.Size())
+
+	replayBody, err := replayable.NewReader()
+	require.NoError(t, err)
+	replay, err := io.ReadAll(replayBody)
+	require.NoError(t, err)
+	require.NoError(t, replayBody.Close())
+	assert.Equal(t, payload, replay)
+}