feat(canvas): 添加视频节点支持功能

- 在后端添加 AI 视频相关接口处理函数
- 扩展前端画布组件支持视频节点类型
- 实现视频上传、生成和播放功能
- 更新画布数据结构文档以包含视频节点
- 添加视频节点的操作工具栏和配置面板
- 集成视频存储和检索服务
- 优化视频节点的渲染和交互体验

web/src/services/api/video.ts

@@ -0,0 +1,25 @@
+import axios from "axios";
+
+import { buildApiUrl, type AiConfig } from "@/stores/use-config-store";
+
+type VideoResponse = { id: string; status?: string; error?: { message?: string } };
+
+function aiApiUrl(config: AiConfig, path: string) {
+    return config.channelMode === "remote" ? `/api/v1${path}` : buildApiUrl(config.baseUrl, path);
+}
+
+function aiHeaders(config: AiConfig) {
+    return config.channelMode === "remote" ? undefined : { Authorization: `Bearer ${config.apiKey}` };
+}
+
+export async function requestVideoGeneration(config: AiConfig, prompt: string) {
+    const created = await axios.post<VideoResponse>(aiApiUrl(config, "/videos"), { model: config.model, prompt, size: config.size || undefined }, { headers: { ...(aiHeaders(config) || {}), "Content-Type": "application/json" } });
+    for (;;) {
+        const video = await axios.get<VideoResponse>(aiApiUrl(config, `/videos/${created.data.id}`), { headers: aiHeaders(config), params: config.channelMode === "remote" ? { model: config.model } : undefined });
+        if (video.data.status === "completed") break;
+        if (video.data.status === "failed" || video.data.status === "cancelled") throw new Error(video.data.error?.message || "视频生成失败");
+        await new Promise((resolve) => setTimeout(resolve, 2500));
+    }
+    const content = await axios.get<Blob>(aiApiUrl(config, `/videos/${created.data.id}/content`), { headers: aiHeaders(config), params: config.channelMode === "remote" ? { model: config.model } : undefined, responseType: "blob" });
+    return content.data;
+}