feat(upstream): 自定义上游支持 Vivid 协议(/v1/generate NDJSON)

- custom 上游新增 protocol 选项(openai|vivid);vivid 走
  POST /v1/generate NDJSON 流:跳过心跳空行,取末行终态,
  断流携 jobId 重连不重复扣费;参考图先 POST /v1/uploads
  拿预签名再 PUT 直传;错误码 4011/4002/4293/5001/4001 分类
- 添加上游弹窗加协议二选一;账号 meta 存 protocol 并可回显
- 附 vivid 链路单测(成功流/URL 透传/失败帧/错误码/两步上传)

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

backend/internal/service/tokens.go

@@ -2,24 +2,24 @@ package service
 
 import (
 	"context"
-	"sync"
-	"sync/atomic"
 	"encoding/base64"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"log"
 	"strings"
+	"sync"
+	"sync/atomic"
 	"time"
 
 	"backend/internal/model"
 	"backend/internal/provider/adobe"
 	"backend/internal/provider/chatgpt"
 	"backend/internal/provider/creativefabrica"
+	"backend/internal/provider/grok"
 	"backend/internal/provider/imagine"
 	"backend/internal/provider/krea"
 	"backend/internal/provider/leonardo"
-	"backend/internal/provider/grok"
 	"backend/internal/provider/runway"
 	"backend/internal/repo"
 
@@ -28,14 +28,14 @@ import (
 )
 
 var validTokenPools = map[string]string{
-	"chatgpt":  "openai",
-	"adobe":    "adobe",
-	"runway":   "runway",
-	"leonardo": "leonardo",
-	"krea":     "krea",
-	"imagine":  "imagine",
-	"grok":     "grok",
-	"custom":   "custom",
+	"chatgpt":         "openai",
+	"adobe":           "adobe",
+	"runway":          "runway",
+	"leonardo":        "leonardo",
+	"krea":            "krea",
+	"imagine":         "imagine",
+	"grok":            "grok",
+	"custom":          "custom",
 	"creativefabrica": "creativefabrica",
 }
 
@@ -1036,7 +1036,6 @@ func (s *TokenService) ImportGrokToken(ctx context.Context, ssoToken, tokenID st
 	return item, nil
 }
 
-
 func (s *TokenService) checkPendingGrok(tokenID, ssoToken string) {
 	defer func() {
 		if r := recover(); r != nil {
@@ -1217,9 +1216,10 @@ func (s *TokenService) checkPendingCreativeFabrica(tokenID, cookie string) {
 // csv list of model ids it serves (empty = all), plus optional weight and
 // per-account concurrency. No probe — the account goes active immediately and is
 // matched to custom models by id at generation time. Calls go direct (no proxy).
-func (s *TokenService) ImportCustomAccount(ctx context.Context, baseURL, apiKey, models, name string, weight, concurrency int, tokenID string) (*model.TokenAccount, error) {
+func (s *TokenService) ImportCustomAccount(ctx context.Context, baseURL, apiKey, models, name, protocol string, weight, concurrency int, tokenID string) (*model.TokenAccount, error) {
 	baseURL = strings.TrimRight(strings.TrimSpace(baseURL), "/")
 	apiKey = strings.TrimSpace(apiKey)
+	protocol = strings.ToLower(strings.TrimSpace(protocol))
 	// Edit mode: tokenID points at an existing custom account. base_url required;
 	// a blank key keeps the stored one.
 	if strings.TrimSpace(tokenID) != "" {
@@ -1230,7 +1230,14 @@ func (s *TokenService) ImportCustomAccount(ctx context.Context, baseURL, apiKey,
 		if baseURL == "" {
 			return nil, errors.New("base_url required")
 		}
-		meta := datatypes.JSONMap{"base_url": baseURL}
+		proto := protocol
+		if proto == "" {
+			proto = strings.ToLower(strings.TrimSpace(stringValue(existing.Meta["protocol"])))
+		}
+		if proto != "vivid" {
+			proto = "openai"
+		}
+		meta := datatypes.JSONMap{"base_url": baseURL, "protocol": proto}
 		if m := strings.TrimSpace(models); m != "" {
 			meta["models"] = m
 		}
@@ -1248,7 +1255,10 @@ func (s *TokenService) ImportCustomAccount(ctx context.Context, baseURL, apiKey,
 	if baseURL == "" || apiKey == "" {
 		return nil, errors.New("base_url and key required")
 	}
-	meta := datatypes.JSONMap{"base_url": baseURL}
+	if protocol != "vivid" {
+		protocol = "openai"
+	}
+	meta := datatypes.JSONMap{"base_url": baseURL, "protocol": protocol}
 	if m := strings.TrimSpace(models); m != "" {
 		meta["models"] = m
 	}
@@ -1952,6 +1962,7 @@ func accountRow(item model.TokenAccount, inFlight int64) map[string]any {
 		"weight":            item.Weight,
 		"concurrency":       item.Concurrency,
 		"base_url":          emptyToNil(strings.TrimSpace(stringValue(item.Meta["base_url"]))),
+		"protocol":          emptyToNil(strings.TrimSpace(stringValue(item.Meta["protocol"]))),
 		"models":            strings.TrimSpace(stringValue(item.Meta["models"])),
 	}
 }