feat: 精油价目页优化 — 名称缩放、去容量、红色底色、下架功能

显示优化:
- 中文名和英文名各一行，nowrap+ellipsis不换行
- 去掉📖 emoji标记
- 去掉右侧容量标签
- 划掉的零售价后面加/瓶，跟会员价一致

管理员功能:
- 信息不全的精油(缺价格/滴数/零售价)显示浅红底色
- 补全后自动恢复正常底色
- 编辑弹窗加"下架"按钮，下架后所有人看到浅灰底色
- 已下架可"重新上架"

后端:
- OilIn model 加 is_active 字段
- upsert 支持更新 is_active

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

backend/main.py

@@ -80,6 +80,7 @@ class OilIn(BaseModel):
     drop_count: int
     retail_price: Optional[float] = None
     en_name: Optional[str] = None
+    is_active: Optional[int] = None
 
 
 class IngredientIn(BaseModel):
@@ -659,10 +660,11 @@ def list_oils():
 def upsert_oil(oil: OilIn, user=Depends(require_role("admin", "senior_editor"))):
     conn = get_db()
     conn.execute(
-        "INSERT INTO oils (name, bottle_price, drop_count, retail_price, en_name) VALUES (?, ?, ?, ?, ?) "
+        "INSERT INTO oils (name, bottle_price, drop_count, retail_price, en_name, is_active) VALUES (?, ?, ?, ?, ?, ?) "
         "ON CONFLICT(name) DO UPDATE SET bottle_price=excluded.bottle_price, drop_count=excluded.drop_count, "
-        "retail_price=excluded.retail_price, en_name=COALESCE(excluded.en_name, oils.en_name)",
-        (oil.name, oil.bottle_price, oil.drop_count, oil.retail_price, oil.en_name),
+        "retail_price=excluded.retail_price, en_name=COALESCE(excluded.en_name, oils.en_name), "
+        "is_active=COALESCE(excluded.is_active, oils.is_active)",
+        (oil.name, oil.bottle_price, oil.drop_count, oil.retail_price, oil.en_name, oil.is_active),
     )
     log_audit(conn, user["id"], "upsert_oil", "oil", oil.name, oil.name,
               json.dumps({"bottle_price": oil.bottle_price, "drop_count": oil.drop_count}))