Replace broken media.ccc.de plugin with maintained fork

[PixelMelt]

Summary

• Replaces the old, broken/unmaintained media.ccc.de plugin (by Alex-451) with a maintained fork from PixelMelt/grayjay-source-ccc
• The new plugin is a complete rewrite forked from OnlinePersona's original, with significantly expanded functionality

Changes

• Author: Alex → OnlinePersona & PixelMelt
• Repository: Alex-451/grayjay-media.ccc-plugin → PixelMelt/grayjay-source-ccc
• Tags: broken, unmaintained → working, maintained
• Version: 1 → 2
• New plugin ID (new codebase, not a drop-in update)
• Scoped allowUrls: everywhere → only media.ccc.de, static.media.ccc.de, cdn.media.ccc.de, api.media.ccc.de
• Signed: includes scriptSignature and scriptPublicKey
• Added fields: platformUrl, settings (language filter), changelog, maxDownloadParallelism, subscriptionRateLimit

New Plugin Features

• Home feed with pagination into 15,000+ event archive
• Full-text search across all events
• Conferences as channels with per-conference filtering
• Video recommendations from the same conference
• Multi-quality video (H.264, VP9, AV1) and audio-only tracks (MP3, Opus)
• VTT subtitles with language labels
• Multi-language recording filter setting
• Rich descriptions with speakers, tags, and event page links
• Bitrate estimation from file size metadata

[PixelMelt]

This PR was mostly AI generated but I have confirmed the plugin functions to the point that I will be using it myself and that the code quality is satisfactory, also the previous plugin is not installable by the grayjay android app due to signature errors