test(01-02): add Wave 0 TDD stubs for SC-3 (Zod schemas) and SC-4 (wizard reducer)

- src/schemas/index.test.ts: 8 tests defining acceptance criteria for BACKEND_SCHEMAS (Plan 03)
- src/store/reducer.test.ts: 8 tests defining acceptance criteria for wizardReducer (Plan 04)
- Both files fail with "Cannot find module" — correct RED phase, implementation deferred to Plans 03-04

src/schemas/index.test.ts

@@ -0,0 +1,72 @@
+import { describe, it, expect } from 'vitest';
+import { BACKEND_SCHEMAS } from './index';
+
+describe('Azure Blob Zod schema', () => {
+  it('accepts valid account + access key', () => {
+    const result = BACKEND_SCHEMAS.azureblob.safeParse({
+      account: 'mystorageaccount',
+      key: 'dGVzdGtleQ==',
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('accepts valid account + sas_url', () => {
+    const result = BACKEND_SCHEMAS.azureblob.safeParse({
+      account: 'mystorageaccount',
+      sas_url: 'https://mystorageaccount.blob.core.windows.net/?sv=2021-01-01',
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('rejects empty account (required field)', () => {
+    const result = BACKEND_SCHEMAS.azureblob.safeParse({ account: '' });
+    expect(result.success).toBe(false);
+  });
+
+  it('rejects missing account (required field)', () => {
+    const result = BACKEND_SCHEMAS.azureblob.safeParse({ key: 'dGVzdGtleQ==' });
+    expect(result.success).toBe(false);
+  });
+});
+
+describe('S3 Zod schema', () => {
+  it('accepts valid S3 credentials', () => {
+    const result = BACKEND_SCHEMAS.s3.safeParse({
+      provider: 'AWS',
+      access_key_id: 'AKIAIOSFODNN7EXAMPLE',
+      secret_access_key: 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY',
+      region: 'us-east-1',
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('rejects missing access_key_id (required field)', () => {
+    const result = BACKEND_SCHEMAS.s3.safeParse({
+      provider: 'AWS',
+      secret_access_key: 'secret',
+      region: 'us-east-1',
+    });
+    expect(result.success).toBe(false);
+  });
+});
+
+describe('S3-compatible Zod schema', () => {
+  it('accepts valid S3-compatible credentials with endpoint', () => {
+    const result = BACKEND_SCHEMAS['s3-compatible'].safeParse({
+      provider: 'Other',
+      access_key_id: 'mykey',
+      secret_access_key: 'mysecret',
+      endpoint: 'https://s3.wasabisys.com',
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('rejects missing endpoint (required for s3-compatible)', () => {
+    const result = BACKEND_SCHEMAS['s3-compatible'].safeParse({
+      provider: 'Other',
+      access_key_id: 'mykey',
+      secret_access_key: 'mysecret',
+    });
+    expect(result.success).toBe(false);
+  });
+});