fix pgvector compose image

[erichanwang]

fixes #1684

what changed:

• replaced the removed ankane/pgvector:v0.8.0 image with pgvector/pgvector:pg16 in docker/docker-compose.yml

why:
the documented docker stack fails at image pull time because the old pgvector image tag no longer resolves.

checks:

• docker compose -f docker/docker-compose.yml config
• docker manifest inspect pgvector/pgvector:pg16

breaking changes: none

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[erichanwang]

closing this draft as duplicate of #1685, which already covers #1684 with the same pgvector image replacement and live compose verification.