v2.38 — Issue #2: Dauerverbindung Cloud Server (persistenter http.Client)

- CloudService: static final http.Client _client als Instanzvariable
- Alle http.get/post/put/delete/upload nutzen nun _client statt neuem Client
- DownloadService: gleicher Fix für _retryHttpPost und _retryHttpGet
Build: ✓ flutter analyze

lib/services/cloud_service.dart

@@ -8,6 +8,8 @@ import '../services/melo_logger.dart';
 /// Cloud-Sync Service für Melo Registry (v3 — vollständiges Sync-System)
 /// Authentifizierung via Baka-Auth JWT-Token
 class CloudService {
+  static final http.Client _client = http.Client();
+
   static String get _base => AppConfig.cloudUrl;
   String _user = '';
 
@@ -15,7 +17,7 @@ class CloudService {
   Future<bool> login(String user) async {
     _user = user;
     try {
-      final r = await http
+      final r = await _client
           .get(Uri.parse('$_base/api/cloud/status'),
               headers: _authHeader)
           .timeout(const Duration(seconds: 5));
@@ -63,7 +65,7 @@ class CloudService {
       req.files.add(
           await http.MultipartFile.fromPath('file', filepath,
               filename: filename));
-      final resp = await req.send().timeout(const Duration(seconds: 120));
+      final resp = await _client.send(req).timeout(const Duration(seconds: 120));
       final body = jsonDecode(await resp.stream.bytesToString());
       return body['song_id'] as String?;
     } catch (e) {
@@ -74,7 +76,7 @@ class CloudService {
 
   Future<bool> download(String songId, String destPath) async {
     try {
-      final r = await http
+      final r = await _client
           .get(Uri.parse('$_base/api/cloud/download/$songId'),
               headers: _authHeader)
           .timeout(const Duration(seconds: 120));
@@ -91,7 +93,7 @@ class CloudService {
 
   Future<bool> delete(String songId) async {
     try {
-      final r = await http
+      final r = await _client
           .post(Uri.parse('$_base/api/cloud/delete'),
               headers: _jsonHeader,
               body: jsonEncode({'song_id': songId}))
@@ -105,7 +107,7 @@ class CloudService {
   /// Sync-Änderungen seit einem Zeitstempel abrufen
   Future<List<Map>> syncChanges(String since) async {
     try {
-      final r = await http
+      final r = await _client
           .post(Uri.parse('$_base/api/cloud/sync'),
               headers: _jsonHeader,
               body: jsonEncode({'since': since}))
@@ -153,7 +155,7 @@ class CloudService {
   /// Song aus Playlist entfernen
   Future<bool> removeSongFromPlaylist(int playlistId, String songId) async {
     try {
-      final r = await http
+      final r = await _client
           .delete(
               Uri.parse(
                   '$_base/api/cloud/playlists/$playlistId/songs/$songId'),
@@ -169,7 +171,7 @@ class CloudService {
   Future<bool> updatePlaylistPositions(
       int playlistId, List<Map<String, dynamic>> positions) async {
     try {
-      final r = await http
+      final r = await _client
           .put(
               Uri.parse(
                   '$_base/api/cloud/playlists/$playlistId/positions'),
@@ -231,7 +233,7 @@ class CloudService {
 
   Future<List<Map>> globalList() async {
     try {
-      final r = await http
+      final r = await _client
           .get(Uri.parse('$_base/api/cloud/global'), headers: _authHeader)
           .timeout(const Duration(seconds: 10));
       if (r.statusCode == 200) {
@@ -243,7 +245,7 @@ class CloudService {
 
   Future<bool> toggleGlobal(String songId) async {
     try {
-      final r = await http
+      final r = await _client
           .post(Uri.parse('$_base/api/cloud/toggle-global'),
               headers: _jsonHeader,
               body: jsonEncode({'song_id': songId}))
@@ -256,7 +258,7 @@ class CloudService {
 
   Future<String?> share(List<String> songIds) async {
     try {
-      final r = await http
+      final r = await _client
           .post(Uri.parse('$_base/api/cloud/share'),
               headers: _jsonHeader,
               body: jsonEncode({'song_ids': songIds}))
@@ -271,7 +273,7 @@ class CloudService {
 
   Future<Map?> importCode(String code) async {
     try {
-      final r = await http
+      final r = await _client
           .post(Uri.parse('$_base/api/cloud/import'),
               headers: _jsonHeader,
               body: jsonEncode({'code': code}))
@@ -283,7 +285,7 @@ class CloudService {
 
   Future<List<Map>> getCorrupted() async {
     try {
-      final r = await http
+      final r = await _client
           .get(Uri.parse('$_base/api/cloud/corrupted'), headers: _authHeader)
           .timeout(const Duration(seconds: 15));
       if (r.statusCode == 200) {
@@ -300,7 +302,7 @@ class CloudService {
 
   Future<Map?> _get(String path) async {
     try {
-      final r = await http
+      final r = await _client
           .get(Uri.parse('$_base$path'), headers: _authHeader)
           .timeout(const Duration(seconds: 10));
       if (r.statusCode == 200) return jsonDecode(r.body);
@@ -313,7 +315,7 @@ class CloudService {
 
   Future<Map?> _post(String path, Map<String, dynamic> body) async {
     try {
-      final r = await http
+      final r = await _client
           .post(Uri.parse('$_base$path'),
               headers: _jsonHeader, body: jsonEncode(body))
           .timeout(const Duration(seconds: 10));