feat: 自定义 OpenAI 兼容上游聚合 + 权重/并发调度

- custom provider:把任意 v1 端点当账号(base_url+key),按 model id 路由,
  直连不走代理;支持 images/generations、images/edits、Sora 式异步视频
- 调度器全局权重优先 + 每账号并发感知(上游账号可配并发,其余系统固定)
- 后台:添加/编辑上游、自定义模型表单(每档普通/代理价,留空=不支持)、
  账号权重/并发列与导入权重
- grok-video / nano-banana-2(runway) 写入硬编码目录(开源自带);
  去掉 540p,Adobe 视频最低 720p
- UI:SelectMenu 与输入框等高、测试耗时改用秒

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/internal/http/handler/provider_admin.go

@@ -132,6 +132,38 @@ func (h *ProviderAdminHandler) ImportGrokToken(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"ok": true, "id": item.ID, "status": item.Status, "pending": item.Status == "pending"})
 }
 
+func (h *ProviderAdminHandler) ImportCustomAccount(c *gin.Context) {
+	var body struct {
+		BaseURL     string `json:"base_url"`
+		URL         string `json:"url"`
+		Key         string `json:"key"`
+		APIKey      string `json:"api_key"`
+		Models      string `json:"models"`
+		Name        string `json:"name"`
+		Weight      int    `json:"weight"`
+		Concurrency int    `json:"concurrency"`
+		ID          string `json:"id"`
+	}
+	if err := c.ShouldBindJSON(&body); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"detail": "invalid request body"})
+		return
+	}
+	baseURL := body.BaseURL
+	if baseURL == "" {
+		baseURL = body.URL
+	}
+	key := body.Key
+	if key == "" {
+		key = body.APIKey
+	}
+	item, err := h.tokens.ImportCustomAccount(c.Request.Context(), baseURL, key, body.Models, body.Name, body.Weight, body.Concurrency, body.ID)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"detail": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"ok": true, "id": item.ID, "status": item.Status})
+}
+
 func (h *ProviderAdminHandler) ImportKreaCookie(c *gin.Context) {
 	var body struct {
 		Cookie string `json:"cookie"`

backend/internal/http/handler/user_generation.go

@@ -370,13 +370,15 @@ func (h *UserGenerationHandler) catalogEntries(c *gin.Context) ([]gin.H, error)
 			"description":          "Adobe Flux Kontext Max",
 		},
 		{
-			"id":             "nano-banana-2",
-			"provider":       "adobe",
-			"type":           "image",
-			"ratios":         []string{"1:1", "16:9", "9:16", "4:3", "3:4"},
-			"resolutions":    []string{"1K"},
-			"image_to_image": true,
-			"description":    "Adobe Gemini Flash Nano Banana",
+			"id":                   "nano-banana-2",
+			"provider":             "runway",
+			"type":                 "image",
+			"ratios":               []string{"16:9", "9:16", "1:1", "4:3", "3:4", "21:9", "3:2", "5:4", "4:5", "2:3"},
+			"resolutions":          []string{"1K", "2K", "4K"},
+			"image_to_image":       true,
+			"max_reference_images": 6,
+			"reference_mode":       "asset",
+			"description":          "Runway Nano Banana 2 (图/参考图)",
 		},
 		{
 			"id":                   "gemini-veo31",
@@ -405,7 +407,7 @@ func (h *UserGenerationHandler) catalogEntries(c *gin.Context) ([]gin.H, error)
 			"provider":             "adobe",
 			"type":                 "video",
 			"ratios":               []string{"16:9", "1:1", "9:16"},
-			"resolutions":          []string{"540p", "720p", "1080p"},
+			"resolutions":          []string{"720p", "1080p"},
 			"durations":            []string{"5s"},
 			"max_reference_images": 2,
 			"reference_mode":       "frame",
@@ -422,6 +424,17 @@ func (h *UserGenerationHandler) catalogEntries(c *gin.Context) ([]gin.H, error)
 			"reference_mode":       "frame",
 			"description":          "Runway Gen-4 Turbo video (图生视频)",
 		},
+		{
+			"id":                   "grok-video",
+			"provider":             "grok",
+			"type":                 "video",
+			"ratios":               []string{"2:3", "3:2", "1:1", "9:16", "16:9"},
+			"resolutions":          []string{"720p"},
+			"durations":            []string{"6s", "10s"},
+			"max_reference_images": 6,
+			"reference_mode":       "asset",
+			"description":          "Grok Imagine video (文/图生视频)",
+		},
 		{
 			"id":                   "seedream-4.5",
 			"provider":             "leonardo",
@@ -519,11 +532,11 @@ func (h *UserGenerationHandler) publicModels() ([]gin.H, error) {
 		},
 		{
 			"id":          "nano-banana-2",
-			"provider":    "adobe",
+			"provider":    "runway",
 			"kind":        "image",
-			"ratios":      []string{"1:1", "16:9", "9:16", "4:3", "3:4"},
-			"resolutions": []string{"1K"},
-			"description": "Adobe Gemini Flash Nano Banana",
+			"ratios":      []string{"16:9", "9:16", "1:1", "4:3", "3:4", "21:9", "3:2", "5:4", "4:5", "2:3"},
+			"resolutions": []string{"1K", "2K", "4K"},
+			"description": "Runway Nano Banana 2",
 			"stub":        false,
 		},
 		{
@@ -549,7 +562,7 @@ func (h *UserGenerationHandler) publicModels() ([]gin.H, error) {
 			"provider":    "adobe",
 			"kind":        "video",
 			"ratios":      []string{"16:9", "1:1", "9:16"},
-			"resolutions": []string{"540p", "720p", "1080p"},
+			"resolutions": []string{"720p", "1080p"},
 			"description": "Adobe Firefly Video",
 			"stub":        false,
 		},
@@ -562,6 +575,15 @@ func (h *UserGenerationHandler) publicModels() ([]gin.H, error) {
 			"description": "Runway Gen-4 Turbo video",
 			"stub":        false,
 		},
+		{
+			"id":          "grok-video",
+			"provider":    "grok",
+			"kind":        "video",
+			"ratios":      []string{"2:3", "3:2", "1:1", "9:16", "16:9"},
+			"resolutions": []string{"720p"},
+			"description": "Grok Imagine video",
+			"stub":        false,
+		},
 		{
 			"id":          "seedream-4.5",
 			"provider":    "leonardo",