chore: remove duplicate migration and revert schema reordering

The ApiKeyEnvironment.workspaceId column, foreign key, index, and backfill
were already handled by earlier migrations (20260401000000, 20260401000001,
20260402000000). The phase 6 migration was redundant and would fail at
runtime.

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

packages/database/migration/20260401000002_add_workspace_id_to_api_key_environment/migration.sql

@@ -1,15 +0,0 @@
--- AlterTable
-ALTER TABLE "ApiKeyEnvironment" ADD COLUMN "workspaceId" TEXT;
-
--- AddForeignKey
-ALTER TABLE "ApiKeyEnvironment" ADD CONSTRAINT "ApiKeyEnvironment_workspaceId_fkey" FOREIGN KEY ("workspaceId") REFERENCES "Workspace"("id") ON DELETE CASCADE ON UPDATE CASCADE;
-
--- CreateIndex
-CREATE INDEX "ApiKeyEnvironment_workspaceId_idx" ON "ApiKeyEnvironment"("workspaceId");
-
--- Backfill workspaceId from Environment table
-UPDATE "ApiKeyEnvironment" ake
-SET "workspaceId" = e."workspaceId"
-FROM "Environment" e
-WHERE ake."environmentId" = e."id"
-  AND ake."workspaceId" IS NULL;

packages/database/schema.prisma

@@ -669,7 +669,6 @@ model Workspace {
   workspaceTeams                    WorkspaceTeam[]
   customHeadScripts                 String? // Custom HTML scripts for link surveys (self-hosted only)
   feedbackRecordDirectoryWorkspaces FeedbackRecordDirectoryWorkspace[]
-  apiKeyEnvironments                ApiKeyEnvironment[]
 
   // Direct resource relations (for environment deprecation migration)
   surveys              Survey[]
@@ -680,6 +679,7 @@ model Workspace {
   tags                 Tag[]
   segments             Segment[]
   integrations         Integration[]
+  apiKeyEnvironments   ApiKeyEnvironment[]
 
   @@unique([organizationId, name])
 }