Phase 1: Monorepo scaffold, database, and dev environment

Turborepo monorepo with @forte/shared and @forte/backend workspaces.
Docker Compose dev env with PostgreSQL 16 + Valkey 8.
Fastify server with Pino JSON logging, request ID tracing, and
health endpoint. Drizzle ORM with company + location tables.

Includes:
- Root config (turbo, tsconfig, eslint, prettier)
- @forte/shared: types, schemas, currency/date utils
- @forte/backend: Fastify entry, plugins (database, redis, cors,
  error-handler, dev-auth), health route, Drizzle schema + migration
- Dev auth bypass via X-Dev-Company/Location/User headers
- Vitest integration test with clean DB per test (forte_test)
- Seed script for dev company + location

packages/backend/src/main.ts

@@ -0,0 +1,45 @@
+import Fastify from 'fastify'
+import { databasePlugin } from './plugins/database.js'
+import { redisPlugin } from './plugins/redis.js'
+import { corsPlugin } from './plugins/cors.js'
+import { errorHandlerPlugin } from './plugins/error-handler.js'
+import { devAuthPlugin } from './plugins/dev-auth.js'
+import { healthRoutes } from './routes/v1/health.js'
+
+export async function buildApp() {
+  const app = Fastify({
+    logger: {
+      level: process.env.LOG_LEVEL ?? 'info',
+      ...(process.env.NODE_ENV === 'development' ? { transport: { target: 'pino-pretty' } } : {}),
+    },
+    genReqId: () => crypto.randomUUID(),
+  })
+
+  // Plugins
+  await app.register(corsPlugin)
+  await app.register(errorHandlerPlugin)
+  await app.register(databasePlugin)
+  await app.register(redisPlugin)
+  await app.register(devAuthPlugin)
+
+  // Routes
+  await app.register(healthRoutes, { prefix: '/v1' })
+
+  return app
+}
+
+async function start() {
+  const app = await buildApp()
+
+  const port = parseInt(process.env.PORT ?? '8000', 10)
+  const host = process.env.HOST ?? '0.0.0.0'
+
+  try {
+    await app.listen({ port, host })
+  } catch (err) {
+    app.log.error(err)
+    process.exit(1)
+  }
+}
+
+start()