feat(platform): 开源发布 - 初始化 Open AI Canvas

canvas-agent/src/types.ts

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+export type Position = { x: number; y: number };
+export type Viewport = { x: number; y: number; k: number };
+export type CanvasNodeType = "image" | "text" | "script" | "config" | "video" | "audio" | "frame";
+export type CanvasNode = { id: string; type: CanvasNodeType; title?: string; position: Position; width: number; height: number; parentId?: string; metadata?: Record<string, unknown> };
+export type CanvasConnection = { id: string; fromNodeId: string; toNodeId: string; fromHandleId?: string; toHandleId?: string };
+export type CanvasSnapshot = { projectId?: string; title?: string; nodes?: CanvasNode[]; connections?: CanvasConnection[]; selectedNodeIds?: string[]; viewport?: Viewport; clientId?: string };
+export type AgentEmit = (type: string, payload: unknown) => void;
+export type AgentAttachment = { name?: string; type?: string; dataUrl?: string };