#52 Fix the quickstart's server step for new installs

What

• Write hello.yaml in an empty folder, since dagu start-all --dags . loads every YAML file in the folder as a workflow.
• Mention creating the admin account on first launch, and tell script-installer users their background service already runs on port 8080.
• List the new example-06-retry-on-failure first-launch example.
• Link the monitoring page from Next steps.

Why

Companion to dagucloud/dagu#3227, which adds the retry example and the first-run onboarding. Merge after it.

Test plan

• pnpm build passes.

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Summary by cubic

Fixes the quickstart's server step so new installs don't load unrelated YAML files as workflows.

• dagu start-all --dags . treats every YAML file in the folder as a workflow, so the guide now has you save hello.yaml in an empty folder.
• Tells you to create the admin account on first launch unless the installer wizard already created one, and tells script-installer users their background service already runs on port 8080.
• Lists the new example-06-retry-on-failure example and links the monitoring page from Next steps.

Summary by CodeRabbit

• Documentation
  • Clarified where to save the first workflow and how to load YAML files from the current folder.
  • Updated first-launch guidance for creating an admin account, accessing the background service, and exploring six example workflows, including a retry scenario.
  • Added a Monitoring link to the next steps.