T1/Phase 1: scaffold Vite SPA + Hono API + Bun worker

- apps/web: Vite + React 19 + TanStack Router/Query + shadcn/ui
   - apps/api: Hono + Bun on :3001 with /api/health, /api/auth/*, /mcp stubs
   - apps/worker: Bun worker stub, DB connection, graceful SIGTERM
   - apps/web-legacy/: old Next.js code moved aside (preserved for T2-T8 reference)
   - Dockerfiles: api (Bun), worker (Bun), spa (multi-stage Caddy)
   - Caddyfile: serves dist + reverse-proxies /api/* + /mcp to api
   - docker-compose.yml: 4-service target (api, spa, db, worker)
   - packages/db/src/client.ts: shared Drizzle client for api + worker
   - db/client.ts: root-level alias for convenience

   Parent: t_e1cbd87d -> t_24c9c3fd (T0)

apps/web-legacy/jest.config.js

@@ -0,0 +1,16 @@
+/** @type {import('jest').Config} */
+const config = {
+  testEnvironment: 'node',
+  transform: {
+    '^.+\\.(t|j)sx?$': ['@swc/jest'],
+  },
+  moduleNameMapper: {
+    '^@/(.*)$': '<rootDir>/$1',
+    '^@project-e/db$': '<rootDir>/../../packages/db/src',
+    '^@project-e/shared$': '<rootDir>/../../packages/shared/src',
+  },
+  testMatch: ['**/__tests__/**/*.test.(ts|tsx|js)'],
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json'],
+};
+
+module.exports = config;