feat: add WeChat media analysis adapters

wechat/ack/ack-builders.mjs

@@ -21,6 +21,12 @@ const ImageBuilder = {
   build: (ctx) => buildText(TEMPLATES.image, ctx),
 };
 
+const FileBuilder = {
+  priority: 80,
+  support: (ctx) => ctx.msgType === 'file',
+  build: (ctx) => buildText(TEMPLATES.file, ctx),
+};
+
 const VoiceBuilder = {
   priority: 80,
   support: (ctx) => ctx.msgType === 'voice',
@@ -54,7 +60,7 @@ const DefaultBuilder = {
   build: (ctx) => buildText(TEMPLATES.default, ctx),
 };
 
-const BUILDERS = [ImageBuilder, VoiceBuilder, LocationBuilder, LinkBuilder, IntentBuilder, DefaultBuilder]
+const BUILDERS = [ImageBuilder, FileBuilder, VoiceBuilder, LocationBuilder, LinkBuilder, IntentBuilder, DefaultBuilder]
   .sort((a, b) => b.priority - a.priority);
 
 export function selectBuilder(ctx) {

wechat/ack/ack-intent.mjs

@@ -13,6 +13,7 @@ const INTENT_RULES = [
 
 export function resolveIntent(msgType, text) {
   if (msgType === 'image') return { task: 'image_analysis' };
+  if (msgType === 'file') return { task: 'file_analysis' };
   if (msgType === 'voice') return { task: 'voice_analysis' };
   if (msgType === 'location') return { task: 'location' };
   if (msgType === 'link') return { task: 'link' };

wechat/ack/ack-provider.test.mjs

@@ -26,6 +26,11 @@ describe('buildAckText', () => {
     assert.equal(result, '图片收到，我先看看。');
   });
 
+  it('file → file template', () => {
+    const result = buildAckText({ intent: intent('file'), nickname: '', config: cfg, fallbackText: '' });
+    assert.equal(result, '文件收到，我先读取分析。');
+  });
+
   it('voice → voice template', () => {
     const result = buildAckText({ intent: intent('voice'), nickname: '', config: cfg, fallbackText: '' });
     assert.equal(result, '收到语音，我先听一下。');

wechat/ack/ack-templates.mjs

@@ -12,6 +12,7 @@ export const TEMPLATES = {
     '让我看看这张图片。',
     '图片已收到，我来处理。',
   ],
+  file: ['文件收到，我先读取分析。'],
   voice: [
     '收到语音，我先听一下。',
     '听到啦，我马上处理。',

wechat/prompts/chat-general.mjs

@@ -81,6 +81,20 @@ export function buildWechatAgentPrompt(intent, { grantedSkills = [] } = {}) {
       .filter(Boolean)
       .join('\n');
   }
+  if (msgType === 'file') {
+    const attachment = intent?.attachment ?? {};
+    return [
+      currentTimeHint,
+      '【微信服务号文件消息】用户发送了需要解析的 Office 文件。',
+      attachment.filename ? `文件名：${attachment.filename}` : '',
+      attachment.publicUrl ? `文件链接：${attachment.publicUrl}` : '',
+      '请复用 H5 附件分析结果回答；Excel 在专用工具可用时必须优先使用 Excel 工具读取完整工作簿。',
+      '',
+      String(agentText).trim(),
+    ]
+      .filter(Boolean)
+      .join('\n');
+  }
   if (msgType === 'location') {
     const location = intent?.location ?? {};
     return [