fix: 支持HEIC格式上传 + 压缩目标调小

- HEIC/HEIF格式自动转换为JPEG后压缩
- 压缩目标调小确保不超后端限制（QR/logo 300KB，背景 600KB）

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.0.0",
       "dependencies": {
         "exceljs": "^4.4.0",
+        "heic2any": "^0.0.4",
         "html2canvas": "^1.4.1",
         "pinia": "^2.3.1",
         "vue": "^3.5.32",
@@ -2871,6 +2872,12 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/heic2any": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/heic2any/-/heic2any-0.0.4.tgz",
+      "integrity": "sha512-3lLnZiDELfabVH87htnRolZ2iehX9zwpRyGNz22GKXIu0fznlblf0/ftppXKNqS26dqFSeqfIBhAmAj/uSp0cA==",
+      "license": "MIT"
+    },
     "node_modules/html-encoding-sniffer": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-6.0.0.tgz",

frontend/package.json

@@ -15,6 +15,7 @@
   },
   "dependencies": {
     "exceljs": "^4.4.0",
+    "heic2any": "^0.0.4",
     "html2canvas": "^1.4.1",
     "pinia": "^2.3.1",
     "vue": "^3.5.32",

frontend/src/views/MyDiary.vue

@@ -573,9 +573,16 @@ function checkSquare(base64) {
 }
 
 async function handleUpload(type, event) {
-  const file = event.target.files[0]
+  let file = event.target.files[0]
   if (!file) return
   try {
+    // Convert HEIC/HEIF to JPEG
+    if (file.name.toLowerCase().match(/\.hei[cf]$/)) {
+      ui.showToast('正在转换HEIC格式...')
+      const heic2any = (await import('heic2any')).default
+      const blob = await heic2any({ blob: file, toType: 'image/jpeg', quality: 0.8 })
+      file = new File([blob], file.name.replace(/\.hei[cf]$/i, '.jpg'), { type: 'image/jpeg' })
+    }
     let base64 = await readFileAsBase64(file)
 
     // QR: check if square, offer to crop
@@ -590,8 +597,8 @@ async function handleUpload(type, event) {
       }
     }
 
-    const maxSize = type === 'bg' ? 1000000 : 500000
+    const maxSize = type === 'bg' ? 600000 : 300000
-    const maxDim = type === 'bg' ? 1200 : 800
+    const maxDim = type === 'bg' ? 1000 : 600
     base64 = await compressImage(base64, maxSize, maxDim)
     const fieldMap = { logo: 'brand_logo', bg: 'brand_bg', qr: 'qr_code' }
     const field = fieldMap[type]