ops(ci): add vitest config + sanity tests stub

- bridge/vitest.config.ts : config + coverage v8 + passWithNoTests
- bridge/tests/unit/sanity.test.ts : stub (real tests Phase 2)
- bridge/tests/integration/sanity.test.ts : stub
- Remove tests/.gitkeep

bridge/tests/integration/sanity.test.ts

@@ -0,0 +1,11 @@
+import { describe, expect, it } from 'vitest';
+
+describe('integration sanity', () => {
+  it('environment is reachable', () => {
+    expect(process.env.NODE_ENV).toBeDefined();
+  });
+
+  it('placeholder for future Baserow + Redis integration tests', () => {
+    expect(true).toBe(true);
+  });
+});

bridge/tests/unit/sanity.test.ts

@@ -0,0 +1,11 @@
+import { describe, expect, it } from 'vitest';
+
+describe('sanity', () => {
+  it('node runtime is available', () => {
+    expect(process.version).toMatch(/^v\d+\./);
+  });
+
+  it('basic math works', () => {
+    expect(1 + 1).toBe(2);
+  });
+});

bridge/vitest.config.ts

@@ -0,0 +1,22 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    globals: false,
+    environment: 'node',
+    include: ['tests/**/*.test.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'lcov', 'html'],
+      include: ['src/**/*.ts'],
+      exclude: ['src/**/*.test.ts', 'src/index.ts'],
+      thresholds: {
+        lines: 0,
+        functions: 0,
+        branches: 0,
+        statements: 0,
+      },
+    },
+    passWithNoTests: true,
+  },
+});