test: 智能识别与英文名搜索的单测 + e2e

- 将粘贴解析抽到 useOilProductPaste composable
- 8 条 vitest 覆盖价格/规格/中英文名/类型判断
- 2 条 cypress 覆盖 UI 填充（产品 100ml、精油 15ml）
- 补英文名搜索 e2e；旧 search 用例 placeholder 选择器宽松化

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

frontend/cypress/e2e/oil-reference.cy.js

@@ -16,12 +16,22 @@ describe('Oil Reference Page', () => {
   it('filters oils by search', () => {
     cy.get('.oil-chip').then($chips => {
       const initial = $chips.length
-      cy.get('input[placeholder*="搜索精油"]').type('薰衣草')
+      cy.get('input[placeholder*="搜索"]').type('薰衣草')
       cy.wait(300)
       cy.get('.oil-chip').should('have.length.lt', initial)
     })
   })
 
+  it('filters oils by english name', () => {
+    cy.get('.oil-chip').then($chips => {
+      const initial = $chips.length
+      cy.get('input[placeholder*="搜索"]').type('Lavender')
+      cy.wait(300)
+      cy.get('.oil-chip').should('have.length.lt', initial)
+      cy.get('.oil-chip').should('exist')
+    })
+  })
+
   it('toggles between bottle and drop price view', () => {
     cy.get('.oil-chip').first().invoke('text').then(textBefore => {
       cy.contains('滴价').click()