revert: 删除购油方案功能，修复MyDiary模板错误

完全移除oil_plans相关代码：
- 后端: 7个API端点、2个数据库表
- 前端: plans store、Inventory方案UI、UserManagement方案编辑器
- UserMenu: 方案通知按钮
- 修复MyDiary.vue多余的section-card div导致的构建失败

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

frontend/src/views/Inventory.vue

@@ -2,86 +2,10 @@
   <div class="inventory-page">
     <!-- Login prompt -->
     <div v-if="!auth.isLoggedIn" class="login-prompt">
-      <p>登录后可管理个人库存、获取购油方案</p>
+      <p>登录后可管理个人库存</p>
       <button class="btn-primary" @click="ui.openLogin()">登录 / 注册</button>
     </div>
     <template v-else>
-    <!-- My Oil Plan -->
-    <template v-if="auth.isLoggedIn">
-      <!-- Active plan: show shopping list -->
-      <div v-if="plansStore.activePlan" class="plan-section">
-        <div class="plan-header">
-          <span class="plan-title">📋 {{ plansStore.activePlan.title || '我的购油方案' }}</span>
-          <span class="plan-teacher">by {{ plansStore.activePlan.teacher_name || '老师' }}</span>
-        </div>
-        <div class="plan-recipes-summary">
-          <span v-for="r in plansStore.activePlan.recipes" :key="r.id" class="plan-recipe-chip">
-            {{ r.recipe_name }} × {{ r.times_per_month }}/月
-          </span>
-        </div>
-        <div v-if="plansStore.shoppingList.length" class="shopping-list">
-          <div class="shopping-header">🛒 本月购油清单</div>
-          <div class="shopping-total">
-            预计月消费：¥{{ shoppingTotal }}
-          </div>
-          <div v-for="item in plansStore.shoppingList" :key="item.oil_name"
-            class="shopping-item" :class="{ owned: item.in_inventory }">
-            <span class="shop-name">{{ item.oil_name }}</span>
-            <span class="shop-drops">{{ item.monthly_drops }}滴/月</span>
-            <span class="shop-bottles">{{ item.bottles_needed }}瓶</span>
-            <span class="shop-cost">¥{{ item.total_cost }}</span>
-            <button v-if="!item.in_inventory" class="shop-add-btn" @click="addOilFromPlan(item.oil_name)">
-              加入库存
-            </button>
-            <span v-else class="shop-owned-tag">已有</span>
-          </div>
-        </div>
-      </div>
-
-      <!-- Pending plan: editable -->
-      <div v-else-if="plansStore.pendingPlans.length" class="plan-section plan-pending">
-        <div class="plan-header">
-          <span class="plan-title">⏳ 老师正在为你定制方案中</span>
-        </div>
-        <textarea v-model="pendingDesc" class="form-textarea" rows="3" @blur="updatePendingDesc"></textarea>
-        <div class="plan-pending-hint">修改后老师会收到通知</div>
-      </div>
-
-      <!-- No plan: request button -->
-      <div v-else class="plan-request-bar">
-        <button class="btn-primary" @click="showPlanRequest = true">📋 请求定制购油方案</button>
-      </div>
-
-      <!-- Plan request modal -->
-      <div v-if="showPlanRequest" class="overlay" @mousedown.self="showPlanRequest = false">
-        <div class="overlay-panel" style="max-width:400px">
-          <div class="overlay-header">
-            <h3>请求定制方案</h3>
-            <button class="btn-close" @click="showPlanRequest = false">✕</button>
-          </div>
-          <div style="padding:16px">
-            <label class="form-label">描述你的健康需求</label>
-            <textarea v-model="planHealthDesc" class="form-textarea" rows="4"
-              placeholder="例如：家里有老人膝盖痛，小孩经常感冒咳嗽，我自己想改善睡眠..."></textarea>
-            <label class="form-label" style="margin-top:12px">输入老师的名字</label>
-            <input v-model="planTeacherName" class="form-input" placeholder="请输入老师告诉你的名字"
-              @input="matchTeacher" />
-            <div v-if="matchedTeacher" class="teacher-matched">
-              已匹配：{{ matchedTeacher.display_name }}
-            </div>
-            <div v-else-if="planTeacherName.trim() && !matchedTeacher" class="teacher-no-match">
-              未找到该老师，请确认名字是否正确
-            </div>
-            <button class="btn-primary" style="width:100%;margin-top:16px"
-              :disabled="!planHealthDesc.trim() || !matchedTeacher"
-              @click="submitPlanRequest">
-              发送请求
-            </button>
-          </div>
-        </div>
-      </div>
-    </template>
-
     <!-- Search + direct add -->
     <div class="search-box">
       <input
@@ -176,14 +100,12 @@ import { useAuthStore } from '../stores/auth'
 import { useOilsStore } from '../stores/oils'
 import { useRecipesStore } from '../stores/recipes'
 import { useUiStore } from '../stores/ui'
-import { usePlansStore } from '../stores/plans'
 import { api } from '../composables/useApi'
 
 const auth = useAuthStore()
 const oils = useOilsStore()
 const recipeStore = useRecipesStore()
 const ui = useUiStore()
-const plansStore = usePlansStore()
 
 const searchQuery = ref('')
 const ownedOils = ref([])
@@ -318,86 +240,14 @@ async function toggleOil(name) {
   await saveInventory()
 }
 
-// Plan request
-const showPlanRequest = ref(false)
-const planHealthDesc = ref('')
-const planTeacherName = ref('')
-const matchedTeacher = ref(null)
-
-function matchTeacher() {
-  const name = planTeacherName.value.trim()
-  if (!name) { matchedTeacher.value = null; return }
-  matchedTeacher.value = plansStore.teachers.find(t =>
-    t.display_name === name || t.username === name
-  ) || null
-}
-
-const pendingDesc = ref('')
-
-// Sync pendingDesc when plans load
-watch(() => plansStore.pendingPlans, (pp) => {
-  if (pp.length) pendingDesc.value = pp[0].health_desc || ''
-}, { immediate: true })
-
-async function updatePendingDesc() {
-  const plan = plansStore.pendingPlans[0]
-  if (!plan || pendingDesc.value === plan.health_desc) return
-  try {
-    await api(`/api/oil-plans/${plan.id}`, {
-      method: 'PUT',
-      body: JSON.stringify({ health_desc: pendingDesc.value }),
-    })
-    plan.health_desc = pendingDesc.value
-    ui.showToast('已更新，老师会收到通知')
-  } catch {
-    ui.showToast('更新失败')
-  }
-}
-
-const shoppingTotal = computed(() =>
-  plansStore.shoppingList.filter(i => !i.in_inventory).reduce((s, i) => s + i.total_cost, 0).toFixed(2)
-)
-
-async function submitPlanRequest() {
-  try {
-    await plansStore.createPlan(planHealthDesc.value, matchedTeacher.value.id)
-    showPlanRequest.value = false
-    planHealthDesc.value = ''
-    planTeacherName.value = ''
-    matchedTeacher.value = null
-    ui.showToast('已发送方案请求')
-  } catch {
-    ui.showToast('发送失败')
-  }
-}
-
-async function addOilFromPlan(name) {
-  if (!ownedOils.value.includes(name)) {
-    ownedOils.value.push(name)
-    ownedOils.value.sort((a, b) => a.localeCompare(b, 'zh'))
-    await saveInventory()
-  }
-  // Refresh shopping list
-  if (plansStore.activePlan) {
-    await plansStore.loadShoppingList(plansStore.activePlan.id)
-  }
-  ui.showToast(`${name} 已加入库存`)
-}
-
 async function clearAll() {
   ownedOils.value = []
   await saveInventory()
   ui.showToast('已清空库存')
 }
 
-onMounted(async () => {
-  await loadInventory()
-  if (auth.isLoggedIn) {
-    await Promise.all([plansStore.loadPlans(), plansStore.loadTeachers()])
-    if (plansStore.activePlan) {
-      await plansStore.loadShoppingList(plansStore.activePlan.id)
-    }
-  }
+onMounted(() => {
+  loadInventory()
 })
 </script>
 
@@ -631,49 +481,6 @@ onMounted(async () => {
   padding: 24px 0;
 }
 
-/* Plan section */
-.plan-section {
-  background: #f8faf8; border: 1.5px solid #d4e8d4; border-radius: 12px;
-  padding: 14px; margin-bottom: 16px;
-}
-.plan-pending { border-color: #e5e4e7; background: #fafafa; }
-.plan-header { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
-.plan-title { font-weight: 600; font-size: 15px; color: #2e7d5a; }
-.plan-teacher { font-size: 12px; color: #b0aab5; }
-.plan-desc { font-size: 13px; color: #6b6375; margin: 0; }
-.plan-recipes-summary { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
-.plan-recipe-chip {
-  font-size: 11px; padding: 3px 10px; border-radius: 8px;
-  background: #e8f5e9; color: #2e7d5a; white-space: nowrap;
-}
-.shopping-list { margin-top: 8px; }
-.shopping-header { font-weight: 600; font-size: 14px; color: #3e3a44; margin-bottom: 4px; }
-.shopping-total { font-size: 12px; color: #5a7d5e; margin-bottom: 8px; font-weight: 500; }
-.shopping-item {
-  display: flex; align-items: center; gap: 8px; padding: 6px 0;
-  border-bottom: 1px solid #eee; font-size: 13px;
-}
-.shopping-item.owned { opacity: 0.5; }
-.shop-name { flex: 1; font-weight: 500; color: #3e3a44; }
-.shop-drops { color: #6b6375; font-size: 12px; white-space: nowrap; }
-.shop-bottles { color: #5a7d5e; font-size: 12px; white-space: nowrap; }
-.shop-cost { color: #5a7d5e; font-weight: 600; font-size: 12px; white-space: nowrap; }
-.shop-add-btn {
-  padding: 2px 10px; border-radius: 6px; border: 1px solid #7ec6a4;
-  background: #fff; color: #2e7d5a; font-size: 11px; cursor: pointer; font-family: inherit;
-}
-.shop-add-btn:hover { background: #e8f5e9; }
-.shop-owned-tag { font-size: 11px; color: #b0aab5; }
-.plan-request-bar { text-align: center; margin-bottom: 16px; }
-.overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.4); z-index: 100; display: flex; align-items: center; justify-content: center; }
-.overlay-panel { background: #fff; border-radius: 14px; width: 90%; max-width: 420px; max-height: 80vh; overflow-y: auto; }
-.overlay-header { display: flex; align-items: center; justify-content: space-between; padding: 14px 16px; border-bottom: 1px solid #eee; }
-.overlay-header h3 { margin: 0; font-size: 16px; }
-.form-label { display: block; font-size: 13px; color: #6b6375; margin-bottom: 4px; font-weight: 500; }
-.form-textarea { width: 100%; border: 1.5px solid #e5e4e7; border-radius: 8px; padding: 8px; font-size: 13px; font-family: inherit; resize: vertical; box-sizing: border-box; }
 .login-prompt { text-align: center; padding: 60px 20px; color: #6b6375; }
 .login-prompt p { margin-bottom: 16px; font-size: 15px; }
-.plan-pending-hint { font-size: 11px; color: #b0aab5; margin-top: 4px; }
-.teacher-matched { color: #2e7d5a; font-size: 13px; margin-top: 4px; font-weight: 500; }
-.teacher-no-match { color: #c62828; font-size: 12px; margin-top: 4px; }
 </style>