Serveur réécrit en Rust

Le serveur Dart (bin/) est remplacé par un serveur Rust (server/) :
tokio + axum, reqwest/rustls, SQLite embarqué via rusqlite. Même API,
mêmes routes et mêmes réponses : le front Flutter ne change pas.

La base de production est reprise telle quelle : schéma, migrations et
formats de dates (DateTime.toIso8601String de Dart) sont reproduits à
l'identique, les sessions et hachages existants restent valides.

Comportement conservé : cascade de routage, anti-SSRF, logs masqués,
rate limits, transcodage HLS/turbo.ts avec repli GPU, quotas fournisseur,
enregistrements (reprise, relances, fusion), season passes, EPG, logos de
repli, arrêt gracieux sur SIGTERM. Tests Dart portés (132 tests Rust) ;
la CI exécute fmt, test et clippy -D warnings, l'image Docker compile le
serveur dans un étage rust:1.98.1.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

bin/models/playlist.dart

@@ -1,67 +0,0 @@
-class Playlist {
-  final String id;
-  final String userId;
-  final String name;
-  final String serverUrl;
-  final String username;
-  final String password;
-  final String? dns;
-  final DateTime createdAt;
-  final DateTime updatedAt;
-
-  Playlist({
-    required this.id,
-    required this.userId,
-    required this.name,
-    required this.serverUrl,
-    required this.username,
-    required this.password,
-    this.dns,
-    required this.createdAt,
-    required this.updatedAt,
-  });
-
-  factory Playlist.fromMap(Map<String, dynamic> map) {
-    return Playlist(
-      id: map['id'] as String,
-      userId: map['user_id'] as String,
-      name: map['name'] as String,
-      serverUrl: map['server_url'] as String,
-      username: map['username'] as String,
-      password: map['password'] as String,
-      dns: map['dns'] as String?,
-      createdAt: DateTime.parse(map['created_at'] as String),
-      updatedAt: DateTime.parse(map['updated_at'] as String),
-    );
-  }
-
-  Map<String, dynamic> toJson() {
-    return {
-      'id': id,
-      'userId': userId,
-      'name': name,
-      'serverUrl': serverUrl,
-      'username': username,
-      // Never expose the Xtream password to clients; the backend injects
-      // credentials server-side (see xtream_api_handler.dart).
-      'password': '',
-      'dns': dns,
-      'createdAt': createdAt.toIso8601String(),
-      'updatedAt': updatedAt.toIso8601String(),
-    };
-  }
-
-  Map<String, dynamic> toMap() {
-    return {
-      'id': id,
-      'user_id': userId,
-      'name': name,
-      'server_url': serverUrl,
-      'username': username,
-      'password': password,
-      'dns': dns,
-      'created_at': createdAt.toIso8601String(),
-      'updated_at': updatedAt.toIso8601String(),
-    };
-  }
-}