feat: hybrid cache-busting for thumbnails and covers

- Add Cache-Control: no-cache headers to thumbnail and cover endpoints
  (GET /api/media/{id}/thumbnail, GET /api/sets/{id}/cover,
   GET /s/{token}/thumbnail) so browsers revalidate instead of
   serving stale cached images after regeneration.

- Add frontend cache-busting via ?t=Date.now() after folder cover
  regeneration so the browser fetches the newly overwritten image.

- Replace toolbar filters with inline search syntax (min:, max:,
  tag:, like:, type:, sort:, minsize:, maxsize:) for faster filtering.

- Remove dedicated toolbar and advanced filter panel; consolidate
  all filtering into the search bar.

- Expand filter state to support filesize_min/filesize_max.

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