feat(db): add versioning and lastUpdatedBy to env vars

Add a version integer (default 1) and a lastUpdatedBy JSON field to the
EnvironmentVariableValue model. Include a migration that alters the
EnvironmentVariableValue table to add the version column (NOT NULL,
default 1) and the lastUpdatedBy JSONB column.

This enables simple optimistic versioning and stores metadata about the
actor that last updated an environment variable, improving concurrency
control and auditability.

Author: 0ski

internal-packages/database/prisma/migrations/20260126175159_add_environment_variable_versioning/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "public"."EnvironmentVariableValue" ADD COLUMN     "lastUpdatedBy" JSONB,
+ADD COLUMN     "version" INTEGER NOT NULL DEFAULT 1;

internal-packages/database/prisma/schema.prisma

@@ -1713,6 +1713,9 @@ model EnvironmentVariableValue {
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
 
+  version       Int                    @default(1)
+  lastUpdatedBy Json?
+
   @@unique([variableId, environmentId])
 }