chore: refactor watch system resource hook

[louis-jan]

Describe Your Changes

• Fetch system resource information once on app startup
• Refactor system resource hook to add watch, stop watching and fetch once
• Hooks should not trigger DataLoader fetch again

// useGetSystemResources.ts

return {
  /**
   * Fetch resource informations once
   */
  getSystemResources,
  /**
   *  Fetch & watch for resource update
   */
  watch,
  /**
   *  Stop watching
   */
  stopWatching,
}

Fixes Issues

• Closes #

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed