Compose for TV UI, generic + Dispatcharr sources, device-flow login, favorites, stream profiles, richer remote

- Compose for TV scaffold: D-pad app shell (Live/Einstellungen), channel list
  with focus handling, fullscreen player with auto-hiding overlay; zapping via
  channel/D-pad keys (closes #2)
- Generic source end-to-end: M3U + XMLTV configurable on the TV, Now/Next with
  progress in the list, channel cache (closes #3)
- OIDC device-flow login: server URL is the only input, issuer/client id come
  from the fork's status endpoint; QR + user code screen, silent refresh,
  logout (closes #4)
- Dispatcharr source via Bearer API: channels, groups, EPG grid; switchable
  against the generic source (closes #5)
- Per-user favorites: star via long-press, favorites filter, backend-synced
  (closes #6)
- Stream profile selection (Standard/Passthrough/audiofix/720p from the
  backend profile list), applied per stream URL (closes #7)
- Phone remote: Now/Next lines, favorites star + filter over the WebSocket
  protocol (closes #8)

Device verification pending (TV currently in use).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

build.gradle.kts

@@ -1,4 +1,5 @@
 plugins {
     id("com.android.application") version "8.7.3" apply false
     id("org.jetbrains.kotlin.android") version "2.0.21" apply false
+    id("org.jetbrains.kotlin.plugin.compose") version "2.0.21" apply false
 }