fix(db): drop FKs to removed users table so db:migrate completes

[gomessguii]

Summary

• Seven migrations still referenced a users table that no longer exists in community (removed in 9944be0 when identity moved to evo-auth-service). db:migrate aborted on the first of them (CreateFacebookCommentModerations), blocking MakeAttachmentPolymorphic and leaving attachments stuck with the legacy message_id column. Sidekiq/Puma then crashed with PG::UndefinedColumn: attachments.attachable_id does not exist on any media webhook or contact deletion.
• Each foreign_key: { to_table: :users } / add_foreign_key …, :users swapped for a plain uuid column (same name, so models keep working) plus manual indexes where the auto-generated ones went away.
• docker/docker-entrypoint.sh: collapsed the db:create / db:migrate / db:evolution_prepare trio (all masked by 2>/dev/null || true) into a single unmasked bundle exec rails db:evolution_prepare. The mask is what hid the abort in the first place — a broken migration must stop the boot.

Root cause

The account/user removal refactor (9944be0) only touched db/schema.rb; the downstream migrations that reference :users were never scrubbed. The version: 9025_08_19_224901 bump in that same commit papers over the problem via assume_migrated_upto_version — it only works on the db:schema:load path. Any db:migrate on an empty DB still walks the migrations in chronological order and hits the FK abort.

Test plan

• db:migrate against a clean Postgres completes: 51/51 migrations applied, 0 pending.
• \d attachments on the resulting DB shows attachable_type / attachable_id (with index_attachments_on_attachable_type_and_attachable_id) and no message_id.
• schema_migrations contains 20251119155458 (the previously-blocked polymorphic migration).
• Deploy against an existing installation that already patched the columns manually: confirm MakeAttachmentPolymorphic idempotency (may need a follow-up guard).
• Smoke the Sidekiq webhook receiving media and the contact deletion flow end-to-end once the image is rebuilt.

[sourcery-ai]

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