feat: initial commit - oncology literature search platform

OncoLit: a multi-tenant oncology literature search, feed, and
collaboration platform. Built with FastAPI + Vue 3 + PostgreSQL.
Includes PubMed pipeline, drug approvals, AI summaries, and
systematic review tools.

frontend/src/__tests__/placeholder.test.ts

@@ -0,0 +1,7 @@
+import { describe, it, expect } from 'vitest'
+
+describe('placeholder', () => {
+  it('should pass', () => {
+    expect(1 + 1).toBe(2)
+  })
+})

frontend/src/__tests__/setup.ts

@@ -0,0 +1,23 @@
+import { vi } from 'vitest'
+
+// Mock Naive UI composables used by useToast and components
+// Keep all component exports via importOriginal so shallowMount can resolve them
+vi.mock('naive-ui', async (importOriginal) => {
+  const mod: Record<string, unknown> = await importOriginal()
+  return {
+    ...mod,
+    useMessage: () => ({
+      success: vi.fn(),
+      error: vi.fn(),
+      warning: vi.fn(),
+      info: vi.fn(),
+    }),
+    useDialog: () => ({
+      success: vi.fn(),
+      error: vi.fn(),
+      warning: vi.fn(),
+      info: vi.fn(),
+    }),
+    create: vi.fn(),
+  }
+})