[Backend] Add Asset Notes Sub-Resource

[yusuftomilola]

Users need to be able to attach free-text notes to assets for informal record keeping.

Requirements

AssetNote entity: id UUID, assetId string, content text, createdBy ManyToOne → User, createdAt

Endpoints:

• GET /api/assets/:id/notes — List all notes for an asset, newest first
• POST /api/assets/:id/notes — Add a note (content required); logs a NOTE_ADDED history entry
• DELETE /api/assets/:id/notes/:noteId — Delete a note (responds 204)

Acceptance Criteria

• Notes are scoped to their asset (cannot access another asset's notes via wrong :id)
• Adding a note creates a history entry
• Delete returns 204

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[mftee]

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