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Description

## Task
Create Tiltfile and docker-compose.dev.yml for local development with hot reload.

## Requirements
1. Hot reload for:
   - API (Python/FastAPI) - use volume mounts + watchfiles
   - Dashboard (React/Vite) - use Vite HMR
   - Workers (Python) - volume mounts + auto-restart

2. Services in docker-compose.dev.yml:
   - postgres (local dev instance, NOT pg.rodmena.app)
   - api (port 7822)
   - dashboard (port 3000)
   - worker (1 replica)
   - activity-worker (1 replica)
   - internal-worker (1 replica)
   - vault (dev mode, optional)

3. Tiltfile features:
   - Watch engine/ directory -> sync to containers
   - Watch ../highway-dashbaord/src -> sync to dashboard
   - Live reload without full rebuild
   - Tilt UI accessible at tilt.highway.rodmena.app

4. Resource limits (dev is lightweight):
   - Workers: 256Mi memory each
   - API: 512Mi memory
   - Dashboard: 256Mi memory

## Files to create
- docker-compose.dev.yml
- Tiltfile
- docker/dev.env (environment overrides)

## Parent: #726

Due Date (YYYY-MM-DD)

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Edit Issue #728