feat(discover): add Anime section with seasonal toggle

[cakebomb999]

Description

Adds a dedicated Anime browse page at sidebar mirroring the Movies/Series sections with the same sort and filter controls. A toggle switches between the keyword-based TMDB catalogue (sorted, filterable) and the current AniList season.

Seasonal data is fetched from the AniList API resolved to TMDB ids via the Fribb anime-lists mapping with a TMDB title-search fallback deduplicated across split-cours and cached daily. The seasonal animes are also surfaced in the discover section.

How Has This Been Tested?

Deployed on my Server. Wrote tests. Ran pnpm build

Screenshots

Checklist:

• I have read and followed the contribution guidelines.
• Disclosed any use of AI (see our policy)
• I have updated the documentation accordingly.
• All new and existing tests passed.
• Successful build pnpm build
• Translation keys pnpm i18n:extract
• Database migration (if required)

AI Disclosure:
Claude code for tests and api.yml, checks code and corrects bold mistakes.

[coderabbitai]

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[fallenbagel]

please i need this in my life

You can already do this without a new feature: add an anime slider on the home page, then use the edit button on the Discover page to open that view as its own page.

This PR just adds a dedicated page to the sidebar. Use the edit-button route in the meantime.

Separately, please refrain from commenting on PRs that don't add any value to the review. Please keep PR comments scoped to the review itself.

[github-actions]

This pull request has merge conflicts. Please resolve the conflicts so the PR can be successfully reviewed and merged.