接入桌面壳图片导入能力

新增 file.importImage 与 file.imageDropped HostBridge 能力

Tauri 壳通过系统图片选择和主窗口拖拽读取真实图片文件

H5 统一使用导入图片与拖入图片事件 facade

限制图片 MIME 与大小并避免暴露本机绝对路径

更新壳能力校验、测试和架构文档

packages/shared/src/contracts/hostBridge.test.ts

@@ -54,6 +54,8 @@ describe('HostBridge shared contract helpers', () => {
     expect(isHostBridgeCapability('app.lifecycle')).toBe(true);
     expect(isHostBridgeCapability('network.status')).toBe(true);
     expect(isHostBridgeCapability('network.statusChanged')).toBe(true);
+    expect(isHostBridgeCapability('file.importImage')).toBe(true);
+    expect(isHostBridgeCapability('file.imageDropped')).toBe(true);
     expect(isHostBridgeCapability('app.setBadgeCount')).toBe(true);
     expect(isHostBridgeCapability('navigation.canGoBack')).toBe(true);
     expect(isHostBridgeCapability('unknown.capability')).toBe(false);

packages/shared/src/contracts/hostBridge.ts

@@ -28,6 +28,7 @@ export const HOST_BRIDGE_METHODS = [
   'clipboard.writeText',
   'file.exportText',
   'file.exportImage',
+  'file.importImage',
   'haptics.impact',
 ] as const;
 
@@ -38,6 +39,7 @@ export const HOST_BRIDGE_CAPABILITIES = [
   'host.events',
   'app.lifecycle',
   'network.statusChanged',
+  'file.imageDropped',
   'navigation.canGoBack',
 ] as const;
 
@@ -281,6 +283,23 @@ export type FileExportImageResult = {
   bytes: number;
 };
 
+export type HostBridgeImageMimeType =
+  | 'image/png'
+  | 'image/jpeg'
+  | 'image/webp';
+
+export type FileImportImageResult = {
+  action: 'selected' | 'dropped';
+  fileName: string;
+  base64Data: string;
+  mimeType: HostBridgeImageMimeType;
+  bytes: number;
+  position?: {
+    x: number;
+    y: number;
+  };
+};
+
 export type HapticsImpactPayload = {
   style?: 'light' | 'medium' | 'heavy';
 };