feat(server): introduce admin reset functionality and enhance user management

- Added a new `reset-admin` script to reset or create the admin username and password.
- Updated the README to include instructions for resetting the admin login.
- Enhanced user management by allowing username updates during admin reset.
- Defaulted new resources to the internal namespace `local` for better organization.
- Removed unused owner selection from various components to streamline the UI.

Co-authored-by: Nasyarobby Putra <nasyarobby@gmail.com>

packages/server/package.json

@@ -14,6 +14,7 @@
     "migrate": "node -e \"import('./db.js').then((m) => m.migrate().then(() => process.exit(0)))\"",
     "test:plugins": "JFLOW_PLUGINS_DIR=./data/plugins-smoke-test JFLOW_DB_PATH=./data/plugins-smoke.db node test/plugins-smoke.js",
     "test:workflow-history": "JFLOW_WORKFLOWS_DIR=./data/workflow-history-smoke JFLOW_DB_PATH=./data/workflow-history-smoke.db node test/workflow-history-smoke.js",
+    "reset-admin": "node reset-admin.js",
     "test:profiles": "node test/profiles-smoke.js",
     "test:set-dry-run": "node test/set-dry-run-smoke.js"
   },