feat(immich): migrate postgres 14 to 16 with dump/restore

Reverts the v16 revert: data migrated via pg_dumpall from PG14 into a fresh PG16 data directory (same extension versions vectorchord 0.4.3/pgvectors 0.2.0). Verified 1944 assets, 2 users, 10 albums on 16.10. Note: the restore OOMed once at the 2Gi limit during index builds and recovered via WAL replay; worth watching under PG16 load.

immich/compose.yaml

@@ -43,7 +43,7 @@ services:
 
   database:
     container_name: immich_postgres
-    image: ghcr.io/immich-app/postgres:14-vectorchord0.4.3-pgvectors0.2.0@sha256:bcf63357191b76a916ae5eb93464d65c07511da41e3bf7a8416db519b40b1c23
+    image: ghcr.io/immich-app/postgres:16-vectorchord0.4.3-pgvectors0.2.0@sha256:1a078b237c1d9b420b0ee59147386b4aa60d3a07a8e6a402fc84a57e41b043a4
     environment:
       POSTGRES_PASSWORD: ${DB_PASSWORD}
       POSTGRES_USER: ${DB_USERNAME}