fix: 二维码对齐内容区域 + 裁剪提示精简

- QR位置改为top:36px right:36px，与内容padding对齐
- doTERRA行和二维码顶端齐平
- 裁剪提示精简为一行

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

frontend/src/components/RecipeDetailOverlay.vue

@@ -52,7 +52,7 @@
           <!-- Background image overlay -->
           <div v-if="brand.brand_bg" style="position:absolute;inset:0;width:100%;height:100%;background-size:cover;background-position:center;opacity:0.12;pointer-events:none;z-index:0" :style="{ backgroundImage: `url('${brand.brand_bg}')` }"></div>
           <!-- QR: top-right -->
-          <div v-if="brand.qr_code" style="position:absolute;top:20px;right:0;display:flex;flex-direction:column;gap:3px;z-index:3" :style="{ alignItems: (brand.brand_align === 'left' ? 'flex-start' : brand.brand_align === 'right' ? 'flex-end' : 'center') }">
+          <div v-if="brand.qr_code" style="position:absolute;top:36px;right:36px;display:flex;flex-direction:column;gap:3px;z-index:3" :style="{ alignItems: (brand.brand_align === 'left' ? 'flex-start' : brand.brand_align === 'right' ? 'flex-end' : 'center') }">
             <img :src="brand.qr_code" crossorigin="anonymous" style="width:54px;height:54px;object-fit:cover;border-radius:6px;box-shadow:0 2px 6px rgba(0,0,0,0.1)" />
             <div v-if="brand.brand_name" :style="{ textAlign: brand.brand_align || 'center' }" style="font-size:7px;color:var(--text-light);line-height:1.3;max-width:68px;white-space:pre-line">{{ brand.brand_name }}</div>
           </div>

frontend/src/views/MyDiary.vue

@@ -610,7 +610,7 @@ async function handleUpload(type, event) {
       const isSquare = await checkSquare(base64)
       if (!isSquare) {
         const { showConfirm: confirm } = await import('../composables/useDialog')
-        const ok = await confirm('二维码图片不是正方形，是否自动裁剪为正方形？\n（取中心区域）')
+        const ok = await confirm('图片非正方形，自动裁剪？')
         if (ok) {
           base64 = await cropToSquare(base64)
         }