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/routes/v1/health.ts

@@ -0,0 +1,32 @@
+import type { FastifyPluginAsync } from 'fastify'
+import { sql } from 'drizzle-orm'
+
+export const healthRoutes: FastifyPluginAsync = async (app) => {
+  app.get('/health', async (request, reply) => {
+    let dbStatus = 'disconnected'
+    let redisStatus = 'disconnected'
+
+    try {
+      await app.db.execute(sql`SELECT 1`)
+      dbStatus = 'connected'
+    } catch (err) {
+      request.log.error({ err }, 'Database health check failed')
+    }
+
+    try {
+      const pong = await app.redis.ping()
+      redisStatus = pong === 'PONG' ? 'connected' : 'disconnected'
+    } catch (err) {
+      request.log.error({ err }, 'Redis health check failed')
+    }
+
+    const healthy = dbStatus === 'connected' && redisStatus === 'connected'
+
+    reply.status(healthy ? 200 : 503).send({
+      status: healthy ? 'ok' : 'degraded',
+      db: dbStatus,
+      redis: redisStatus,
+      timestamp: new Date().toISOString(),
+    })
+  })
+}