feat: 配方卡片加入上传个人二维码功能

- RecipeDetailOverlay: 未上传二维码/背景图时，卡片上方显示提示横幅，下方出现「上传我的二维码」按钮，点击跳转到 MyDiary 品牌设置页并记录来源配方
- MyDiary: 新增二维码图片上传区域（直接上传图片文件，存为 base64 → PUT /api/brand qr_code 字段）；上传成功后若有待返回配方则自动跳回配方卡片；修复 loadBrandSettings 字段名与后端不一致的问题
- RecipeSearch: 支持 ?openRecipe= 查询参数，页面挂载时自动打开指定配方卡片，实现从 MyDiary 上传后无缝返回

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/RecipeDetailOverlay.vue

@@ -5,7 +5,7 @@
       <div v-if="viewMode === 'card'" class="detail-card-view">
         <!-- Top bar with close + edit -->
         <div class="card-header">
-          <div class="card-top-actions" v-if="authStore.isLoggedIn">
+          <div class="card-top-actions">
             <button class="action-btn action-btn-fav action-btn-sm" @click="handleToggleFavorite">
               {{ isFav ? '★ 已收藏' : '☆ 收藏' }}
             </button>
@@ -36,6 +36,12 @@
           >English</button>
         </div>
 
+        <!-- QR / brand upload hint -->
+        <div v-if="showBrandHint" class="brand-upload-hint">
+          <span class="hint-icon">✨</span>
+          <span>上传你的专属二维码，生成属于自己的配方卡片</span>
+        </div>
+
         <!-- Card image (rendered by html2canvas) -->
         <div v-show="!cardImageUrl" ref="cardRef" class="export-card">
           <!-- Brand overlay layers -->
@@ -122,10 +128,15 @@
           <button class="action-btn" @click="saveImage">💾 保存图片</button>
           <button class="action-btn" @click="copyText">📋 复制文字</button>
           <button
-            v-if="cardLang === 'en'"
+            v-if="cardLang === 'en' && authStore.canManage"
             class="action-btn"
             @click="showTranslationEditor = true"
           >✏️ 修改翻译</button>
+          <button
+            v-if="showBrandHint"
+            class="action-btn action-btn-qr"
+            @click="goUploadQr"
+          >📲 上传我的二维码</button>
         </div>
 
         <!-- Translation editor (inline) -->
@@ -342,6 +353,7 @@
 
 <script setup>
 import { ref, computed, onMounted, nextTick, watch } from 'vue'
+import { useRouter } from 'vue-router'
 import html2canvas from 'html2canvas'
 import { useOilsStore, DROPS_PER_ML, VOLUME_DROPS } from '../stores/oils'
 import { useRecipesStore } from '../stores/recipes'
@@ -363,6 +375,7 @@ const recipesStore = useRecipesStore()
 const authStore = useAuthStore()
 const ui = useUiStore()
 const diaryStore = useDiaryStore()
+const router = useRouter()
 
 // ---- View state ----
 const viewMode = ref('card')
@@ -453,6 +466,18 @@ async function loadBrand() {
   }
 }
 
+// Whether to show the brand/QR upload hint
+const showBrandHint = computed(() =>
+  authStore.isLoggedIn && !!brand.value && !brand.value.qr_code && !brand.value.brand_bg
+)
+
+function goUploadQr() {
+  if (recipe.value._id) {
+    localStorage.setItem('oil_return_recipe_id', recipe.value._id)
+  }
+  router.push('/mydiary')
+}
+
 // ---- Card image generation ----
 async function generateCardImage() {
   if (!cardRef.value || generatingImage.value) return
@@ -787,9 +812,11 @@ async function saveRecipe() {
       name: editName.value.trim(),
       note: editNote.value.trim(),
       tags: editTags.value,
-      ingredients,
+      ingredients: ingredients.map(i => ({ oil_name: i.oil, drops: i.drops })),
     }
     await recipesStore.saveRecipe(payload)
+    // Reload recipes so the data is fresh when re-opened
+    await recipesStore.loadRecipes()
     ui.showToast('保存成功')
     emit('close')
   } catch (e) {
@@ -1134,6 +1161,42 @@ async function saveRecipe() {
   background: var(--sage-mist, #eef4ee);
 }
 
+/* Brand upload hint banner */
+.brand-upload-hint {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  background: linear-gradient(135deg, #eef4ee, #f5f0e8);
+  border: 1.5px dashed var(--sage-light, #c8ddc9);
+  border-radius: 10px;
+  padding: 10px 16px;
+  margin-bottom: 14px;
+  font-size: 13px;
+  color: var(--sage-dark, #5a7d5e);
+  font-weight: 500;
+  animation: hint-pop 0.3s ease;
+}
+
+.hint-icon {
+  font-size: 18px;
+  flex-shrink: 0;
+}
+
+@keyframes hint-pop {
+  from { opacity: 0; transform: translateY(-6px); }
+  to   { opacity: 1; transform: translateY(0); }
+}
+
+.action-btn-qr {
+  background: linear-gradient(135deg, #c8ddc9, var(--sage, #7a9e7e));
+  color: #fff;
+  border-color: transparent;
+}
+
+.action-btn-qr:hover {
+  opacity: 0.88;
+}
+
 /* Card bottom actions */
 .card-bottom-actions {
   display: flex;

frontend/src/views/MyDiary.vue

@@ -123,6 +123,16 @@
           </div>
         </div>
 
+        <div class="form-group">
+          <label>我的二维码图片</label>
+          <div class="upload-area" @click="triggerUpload('qr')">
+            <img v-if="brandQrImage" :src="brandQrImage" class="upload-preview qr-upload-preview" />
+            <span v-else class="upload-hint">📲 点击上传二维码图片</span>
+          </div>
+          <input ref="qrInput" type="file" accept="image/*" style="display:none" @change="handleUpload('qr', $event)" />
+          <div class="field-hint">上传后将显示在配方卡片右下角</div>
+        </div>
+
         <div class="form-group">
           <label>品牌Logo</label>
           <div class="upload-area" @click="triggerUpload('logo')">
@@ -202,6 +212,7 @@
 
 <script setup>
 import { ref, computed, onMounted, watch } from 'vue'
+import { useRouter } from 'vue-router'
 import { useAuthStore } from '../stores/auth'
 import { useOilsStore } from '../stores/oils'
 import { useDiaryStore } from '../stores/diary'
@@ -214,6 +225,7 @@ const auth = useAuthStore()
 const oils = useOilsStore()
 const diaryStore = useDiaryStore()
 const ui = useUiStore()
+const router = useRouter()
 
 const activeTab = ref('brand')
 const pasteText = ref('')
@@ -224,10 +236,12 @@ const newEntryText = ref('')
 // Brand settings
 const brandName = ref('')
 const brandQrUrl = ref('')
+const brandQrImage = ref('')
 const brandLogo = ref('')
 const brandBg = ref('')
 const logoInput = ref(null)
 const bgInput = ref(null)
+const qrInput = ref(null)
 
 // Account settings
 const displayName = ref('')
@@ -345,8 +359,9 @@ async function loadBrandSettings() {
       const data = await res.json()
       brandName.value = data.brand_name || ''
       brandQrUrl.value = data.qr_url || ''
-      brandLogo.value = data.logo_url || ''
+      brandQrImage.value = data.qr_code || ''
-      brandBg.value = data.bg_url || ''
+      brandLogo.value = data.brand_logo || ''
+      brandBg.value = data.brand_bg || ''
     }
   } catch {
     // no brand settings yet
@@ -369,26 +384,46 @@ async function saveBrandSettings() {
 
 function triggerUpload(type) {
   if (type === 'logo') logoInput.value?.click()
-  else bgInput.value?.click()
+  else if (type === 'bg') bgInput.value?.click()
+  else if (type === 'qr') qrInput.value?.click()
+}
+
+function readFileAsBase64(file) {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader()
+    reader.onload = e => resolve(e.target.result)
+    reader.onerror = reject
+    reader.readAsDataURL(file)
+  })
 }
 
 async function handleUpload(type, event) {
   const file = event.target.files[0]
   if (!file) return
-  const formData = new FormData()
-  formData.append('file', file)
-  formData.append('type', type)
   try {
-    const token = localStorage.getItem('oil_auth_token') || ''
+    const base64 = await readFileAsBase64(file)
-    const res = await fetch('/api/brand-upload', {
+    const fieldMap = { logo: 'brand_logo', bg: 'brand_bg', qr: 'qr_code' }
-      method: 'POST',
+    const field = fieldMap[type]
-      headers: token ? { Authorization: 'Bearer ' + token } : {},
+    if (!field) return
-      body: formData,
+    const res = await api('/api/brand', {
+      method: 'PUT',
+      body: JSON.stringify({ [field]: base64 }),
     })
     if (res.ok) {
-      const data = await res.json()
+      if (type === 'logo') brandLogo.value = base64
-      if (type === 'logo') brandLogo.value = data.url
+      else if (type === 'bg') brandBg.value = base64
-      else brandBg.value = data.url
+      else if (type === 'qr') {
+        brandQrImage.value = base64
+        // If user came here from a recipe card, navigate back
+        const returnRecipeId = localStorage.getItem('oil_return_recipe_id')
+        if (returnRecipeId) {
+          localStorage.removeItem('oil_return_recipe_id')
+          ui.showToast('二维码已上传，返回配方卡片 ✨')
+          await new Promise(r => setTimeout(r, 800))
+          router.push('/?openRecipe=' + encodeURIComponent(returnRecipeId))
+          return
+        }
+      }
       ui.showToast('上传成功')
     }
   } catch {
@@ -783,6 +818,18 @@ async function applyBusiness() {
   max-height: 100px;
 }
 
+.qr-upload-preview {
+  max-width: 120px;
+  max-height: 120px;
+}
+
+.field-hint {
+  font-size: 12px;
+  color: #9b94a3;
+  margin-top: 4px;
+  padding-left: 2px;
+}
+
 .upload-hint {
   font-size: 13px;
   color: #b0aab5;

frontend/src/views/RecipeSearch.vue

@@ -123,7 +123,8 @@
 </template>
 
 <script setup>
-import { ref, computed, onMounted, nextTick } from 'vue'
+import { ref, computed, onMounted, nextTick, watch } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
 import { useAuthStore } from '../stores/auth'
 import { useOilsStore } from '../stores/oils'
 import { useRecipesStore } from '../stores/recipes'
@@ -136,6 +137,8 @@ const auth = useAuthStore()
 const oils = useOilsStore()
 const recipeStore = useRecipesStore()
 const ui = useUiStore()
+const route = useRoute()
+const router = useRouter()
 
 const searchQuery = ref('')
 const selectedCategory = ref(null)
@@ -154,6 +157,27 @@ onMounted(async () => {
   } catch {
     // category modules are optional
   }
+
+  // Return to a recipe card after QR upload redirect
+  const openRecipeId = route.query.openRecipe
+  if (openRecipeId) {
+    router.replace({ path: '/', query: {} })
+    const tryOpen = () => {
+      const idx = recipeStore.recipes.findIndex(r => r._id === openRecipeId)
+      if (idx >= 0) {
+        openDetail(idx)
+        return true
+      }
+      return false
+    }
+    if (!tryOpen()) {
+      // Recipes might not be loaded yet, watch until available
+      const stop = watch(
+        () => recipeStore.recipes.length,
+        () => { if (tryOpen()) stop() },
+      )
+    }
+  }
 })
 
 function selectCategory(cat) {