feat: make name optional on BlueprintEntityType for extend path

[pyramation]

Summary

Makes name optional on BlueprintEntityType. When an entity_types[] entry has prefix but no name, it extends an existing entity type (e.g., the built-in org) with storage instead of creating a new entity type.

Changes:

• generate-types.ts: requiredProp('name') → optionalProp('name'), updated JSDoc
• blueprint-types.generated.ts: name: string → name?: string, updated interface/field docs

Companion to constructive-db#1250.

Review & Testing Checklist for Human

• Verify that existing code creating new entity types (with name + prefix) still type-checks correctly
• Confirm the generated file change matches the generator source change (only name optionality + JSDoc)

Notes

Low risk — types-only change. The SQL implementation (constructive-db#1250) is already merged.

Link to Devin session: https://app.devin.ai/sessions/c0494871633d4beb91f1e16e53c776d1
Requested by: @pyramation

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