fix(database): add missing federation table migrations

Federation models (FederationConnection, FederatedIdentity,
FederationMessage) and their enums were defined in the Prisma schema
but never had CREATE TABLE migrations. This caused the
20260203_add_federation_event_subscriptions migration to fail with
"relation federation_messages does not exist".

Adds new migration 20260202200000 to create the 3 missing enums,
3 missing tables, all indexes, and foreign keys. Removes the
now-redundant ALTER TABLE from the 20260203 migration since
event_type is created with the table.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/prisma/migrations/20260203_add_federation_event_subscriptions/migration.sql

@@ -1,9 +1,3 @@
--- Add eventType column to federation_messages table
-ALTER TABLE "federation_messages" ADD COLUMN "event_type" TEXT;
-
--- Add index for eventType
-CREATE INDEX "federation_messages_event_type_idx" ON "federation_messages"("event_type");
-
 -- CreateTable
 CREATE TABLE "federation_event_subscriptions" (
     "id" UUID NOT NULL,