feat: rename storage_table_provisions → provisions, remove storage_config.policies type

[pyramation]

Summary

Updates TypeScript blueprint types to match the storage policy consolidation in constructive-db#962.

Changes

1. Remove BlueprintStoragePolicy type — no longer needed since storage_config.policies was removed
2. Remove policies field from BlueprintStorageConfig interface
3. Rename storage_table_provisions → provisions in BlueprintStorageConfig
4. Update JSDoc to reflect provisions consolidation
5. Regenerate blueprint-types.generated.ts

Companion PRs

• constructive-io/constructive-db#962 — SQL-level consolidation
• constructive-io/constructive-skills — Skill docs update

Review & Testing Checklist for Human

Risk: 🟢 green (type-only changes, no runtime behavior)

• Verify the generated BlueprintStorageConfig type no longer has policies or storage_table_provisions
• Confirm provisions key has the correct shape ({ files?, buckets?, upload_requests? })

Notes

• BlueprintStoragePolicy was only referenced by the removed policies field, so removing it is safe

Link to Devin session: https://app.devin.ai/sessions/ff0b16d790a34cceb17740c9897a295e
Requested by: @pyramation

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