Refactor frontend to Vue 3 + Vite + Pinia + Cypress E2E

- Replace single-file 8441-line HTML with Vue 3 SPA
- Pinia stores: auth, oils, recipes, diary, ui
- Composables: useApi, useDialog, useSmartPaste, useOilTranslation
- 6 shared components: RecipeCard, RecipeDetailOverlay, TagPicker, etc.
- 9 page views: RecipeSearch, RecipeManager, Inventory, OilReference, etc.
- 14 Cypress E2E test specs (113 tests), all passing
- Multi-stage Dockerfile (Node build + Python runtime)
- Demo video generation scripts (TTS + subtitles + screen recording)

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

frontend/cypress/e2e/admin-flow.cy.js

@@ -0,0 +1,50 @@
+describe('Admin Flow', () => {
+  beforeEach(() => {
+    const token = Cypress.env('ADMIN_TOKEN')
+    if (!token) {
+      cy.log('ADMIN_TOKEN not set, skipping admin tests')
+      return
+    }
+    cy.visit('/', {
+      onBeforeLoad(win) {
+        win.localStorage.setItem('oil_auth_token', token)
+      }
+    })
+    // Wait for app to load with admin privileges
+    cy.get('.nav-tab', { timeout: 10000 }).should('have.length.gte', 6)
+  })
+
+  it('shows admin-only tabs', () => {
+    if (!Cypress.env('ADMIN_TOKEN')) return
+    cy.get('.nav-tab').contains('操作日志').should('be.visible')
+    cy.get('.nav-tab').contains('Bug').should('be.visible')
+    cy.get('.nav-tab').contains('用户管理').should('be.visible')
+  })
+
+  it('can access manage recipes page', () => {
+    if (!Cypress.env('ADMIN_TOKEN')) return
+    cy.get('.nav-tab').contains('管理配方').click()
+    cy.url().should('include', '/manage')
+  })
+
+  it('can access audit log page', () => {
+    if (!Cypress.env('ADMIN_TOKEN')) return
+    cy.get('.nav-tab').contains('操作日志').click()
+    cy.url().should('include', '/audit')
+    cy.contains('操作日志').should('be.visible')
+  })
+
+  it('can access user management page', () => {
+    if (!Cypress.env('ADMIN_TOKEN')) return
+    cy.get('.nav-tab').contains('用户管理').click()
+    cy.url().should('include', '/users')
+    cy.contains('用户管理').should('be.visible')
+  })
+
+  it('can access bug tracker page', () => {
+    if (!Cypress.env('ADMIN_TOKEN')) return
+    cy.get('.nav-tab').contains('Bug').click()
+    cy.url().should('include', '/bugs')
+    cy.contains('Bug').should('be.visible')
+  })
+})