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

docker-compose.dev.yml

@@ -0,0 +1,36 @@
+services:
+  postgres:
+    image: postgres:16
+    container_name: forte-postgres
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: forte
+      POSTGRES_PASSWORD: forte
+      POSTGRES_DB: forte
+    ports:
+      - "5432:5432"
+    volumes:
+      - forte-pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U forte"]
+      interval: 5s
+      timeout: 3s
+      retries: 5
+
+  valkey:
+    image: valkey/valkey:8
+    container_name: forte-valkey
+    restart: unless-stopped
+    ports:
+      - "6379:6379"
+    volumes:
+      - forte-valkey:/data
+    healthcheck:
+      test: ["CMD", "valkey-cli", "ping"]
+      interval: 5s
+      timeout: 3s
+      retries: 5
+
+volumes:
+  forte-pgdata:
+  forte-valkey: