feat: 多页面拖拽上传、滚动条精简、UI优化

- 剧本评测/分辨率提升/数字人/角色迁移/图片工作台/去水印/电商：新增外部拖拽文件上传
- 电商：爆款图复刻上传框支持拖拽+大滚动条，短视频/模特图/详情图滚动条精简回退
- 图片工作台：右侧输出面板移至左侧提示词上方，删除局部重绘遮罩/结果框
- 数字人：生成按钮改为「开始生成」
- 局部重绘：编辑遮罩→编辑页面
- 对话框生成器：新增对话/视频模式、模型/速度/深度选择按钮
- 视频时长默认改为5秒
- 工具箱页面空状态logo统一绿底亮色图标
- 多处CSS滚动条和布局优化

src/features/workbench/workbenchConstants.ts

@@ -6,6 +6,9 @@ import type { ReactNode } from "react";
 export type WorkbenchMode = "chat" | "image" | "video";
 export type ToolbarMenuId =
   | "studio-mode"
+  | "chat-model"
+  | "chat-speed"
+  | "chat-depth"
   | "image-model"
   | "image-settings"
   | "image-grid-mode"
@@ -134,6 +137,24 @@ export const REFERENCE_IMAGE_INITIAL_QUALITY = 0.84;
 export const REFERENCE_IMAGE_MIN_QUALITY = 0.62;
 export const CHAT_MODEL = "gemini-3.1-pro";
 
+export const CHAT_MODEL_OPTIONS: WorkbenchOption[] = [
+  { value: "gemini", label: "Gemini" },
+  { value: "wanxian", label: "万相" },
+  { value: "deepseek", label: "DeepSeek" },
+];
+
+export const THINKING_SPEED_OPTIONS: WorkbenchOption[] = [
+  { value: "default", label: "默认" },
+  { value: "high", label: "高" },
+  { value: "ultra", label: "急速" },
+];
+
+export const THINKING_DEPTH_OPTIONS: WorkbenchOption[] = [
+  { value: "default", label: "默认" },
+  { value: "strong", label: "强" },
+  { value: "extreme", label: "极限" },
+];
+
 export const CHAT_NATURAL_SYSTEM_PROMPT = [
   "你是 OmniAI 的创作协作助手，像一个正在一起工作的同伴一样说话。",
   `默认使用自然、简洁的中文，不要官腔，不要机械套话，不要频繁使用“首先、其次、最后”这种模板。`,
@@ -238,7 +259,6 @@ export const VIDEO_FRAME_OPTIONS: WorkbenchOption[] = [
 ];
 
 export const VIDEO_DURATION_OPTIONS: WorkbenchOption[] = [
-  { value: "4", label: "4s" },
   { value: "5", label: "5s" },
   { value: "6", label: "6s" },
   { value: "7", label: "7s" },