improvement(chat): partialize chat store to only persist image URL in… #8512

Job	Run time
Test and Build / Test and Build	4m 56s
Detect Version	3s
Check Docs Changes	0s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME)	4m 4s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS)	2m 28s
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP)	7m 44s
Build ARM64 (GHCR Only)	0s
Create GHCR Manifests	0s
Process Docs	0s
	19m 15s

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