chore: remove old vitest .ts config files

Replaced with .mjs versions for proper ESM support.

apps/web/vitest.config.ts

@@ -1,18 +0,0 @@
-import { resolve } from 'node:path';
-import { defineConfig } from 'vitest/config';
-
-export default defineConfig({
-  test: {
-    globals: true,
-    environment: 'node',
-    include: ['src/**/*.test.ts'],
-    exclude: ['src/test/integration/**/*.test.ts', 'node_modules/**'],
-    setupFiles: ['./src/test/setup.ts'],
-    testTimeout: 30000, // 30s for API calls
-  },
-  resolve: {
-    alias: {
-      '~': resolve(__dirname, './src'),
-    },
-  },
-});

apps/web/vitest.integration.config.ts

@@ -1,23 +0,0 @@
-import { resolve } from 'node:path';
-import { defineConfig } from 'vitest/config';
-
-export default defineConfig({
-  test: {
-    globals: true,
-    environment: 'node',
-    include: ['src/test/integration/**/*.integration.test.ts'],
-    setupFiles: ['./src/test/integration/setup-integration.ts'],
-    testTimeout: 60000, // 60s for API calls to production
-    // Run tests sequentially to avoid race conditions on shared test data
-    sequence: {
-      concurrent: false,
-    },
-    // Fail fast on integration tests
-    bail: 5,
-  },
-  resolve: {
-    alias: {
-      '~': resolve(__dirname, './src'),
-    },
-  },
-});