Rename media-verify addon to Proofmode, remove CDR prefixes

Renames the addon from zammad-addon-media-verify to zammad-addon-proofmode
and removes all cdr_ prefixes from file names and class names per project
naming convention.

- Package: @link-stack/zammad-addon-proofmode (displayName: Proofmode)
- Classes: ProofmodeVerify, ProofmodeVerifyJob
- Files: proofmode_verify.rb, proofmode_verify_job.rb
- Settings: proofmode_verify_enabled
- Migration dir: db/addon/proofmode/

https://claude.ai/code/session_01GJYbRCFFJCJDAEcEVbD36N

packages/zammad-addon-media-verify/scripts/migrate.ts

@@ -1,12 +0,0 @@
-#!/usr/bin/env node
-
-import { promises as fs } from "fs";
-import { createMigration } from "@link-stack/zammad-addon-common/migrate";
-
-const main = async () => {
-  const packageJSON = JSON.parse(await fs.readFile("./package.json", "utf-8"));
-  const { displayName } = packageJSON;
-  await createMigration({ displayName });
-}
-
-main();