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/drizzle.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from 'drizzle-kit'
+
+export default defineConfig({
+  schema: './src/db/schema',
+  out: './src/db/migrations',
+  dialect: 'postgresql',
+  dbCredentials: {
+    url: process.env.DATABASE_URL ?? 'postgresql://forte:forte@localhost:5432/forte',
+  },
+})