## Summary
- Treat explicit null collection fields in Bilibili VOD playback
responses as empty collections.
- Cover DASH streams, backup URLs, Dolby audio, supported formats, DURL
responses, subtitles, video pages, UGC collections, and PGC episodes.
- Resolve Bilibili DASH resources from versioned playback metadata and
provide every equivalent CDN URL to the existing candidate executor.
- Prefer the URL selected by the player, then retry primary and backup
CDNs before committing the downstream response.
## Root cause
Bilibili occasionally emits explicit null for fields normally
represented as JSON arrays, which caused playback/start deserialization
errors. Proxy DASH resource requests also used a single CDN even though
the provider response included backup URLs.
## Validation
- cargo fmt --all -- --check
- cargo check for synctv-api-common, synctv-api-http, and
synctv-api-grpc
- synctv-media-providers Bilibili tests: 91 passed
- synctv-core Bilibili tests: 17 passed, 2 ignored
- candidate executor tests: 2 passed
- Real playback/start, proxy MPD, Range request, CDN fault injection,
dev build, and dev smoke checks
## Summary
- send a typed realtime termination message before server-initiated
WebSocket disconnects
- restore the view_playback_history permission bit across effective
permissions and runtime settings round trips
- remove the unused common ErrorCode enum and document the dedicated
termination codes
## Validation
- make nextest: 6715 passed
- make clippy
- git diff --check
## Summary
- Add recoverable soft deletion for users, rooms, playlists, media, and
chat messages, with retention-based physical cleanup.
- Hide deleted users and owned resources from active API, room,
playback, messaging, and realtime paths while preserving restoration
metadata.
- Add user lifecycle administration across HTTP, gRPC, management
runtime, and SyncTV CLI, including deleted-user listing and restore
operations.
- Add lifecycle migration, cleanup orchestration, audit fields,
resource-change events, and refreshed SQLx offline metadata.
## Design
- Model account, administrator, system, room, and user deletion sources
explicitly so cascade ownership and audit history remain deterministic.
- Release email and OAuth identity occupancy during deletion;
restoration reclaims available identities and reports conflicts
according to restore options.
- Preserve recoverable aggregate rows during the retention window,
remove ephemeral membership and playback state immediately, and purge
expired data in dependency order.
- Wait for realtime observation acknowledgements before publishing
lifecycle changes to avoid subscription registration races.
## Verification
- `make nextest`: 6707 passed, 0 skipped
- `make clippy`: passed for the workspace and all targets
- `make clippy-check`: passed
- `cargo fmt --all -- --check`: passed
- `git diff --check`: passed
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