Syncable Entity: Types & Constants (Step 1/6)

Purpose: Define all types, entities, and register in central constants. This is the foundation - everything else depends on these types being correct.

When to use: First step when creating any new syncable entity. Must be completed before other steps.

Quick Start

This step creates:

1. Metadata name constant (twenty-shared)
2. TypeORM entity (extends SyncableEntity)
3. Flat entity types
4. Action types (universal + flat)
5. Central constant registrations (5 constants)