Replace the server-rendered episode upload form with a Livewire component,
introducing an interactive admin experience that validates the new episode's
stream path against all configured mirrors before saving. The controller-based
`store` method and its route are removed, and episode creation now flows
through the `AdminEpisodeForm` component with frontend upload handling and
dynamic quality checks.
Key changes:
- Add `AdminEpisodeForm` Livewire component with file uploads, tag handling,
and debounced stream/base-url validation.
- Extend `CdnPathValidator::validateStream` to accept an episode number so the
manifest path can point to the specific episode being added.
- Remove the `store` method from `EpisodeController` and its POST route.
- Delete the legacy `createEpisode` method from `EpisodeService`.
- Replace the Blade upload modal with the Livewire view, including progress
indicators and validation badges.
- Add feature tests for the Livewire component and update unit tests for the
CDN validator's episode-specific manifest check.
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