wip: Sicherungs-Commit aller Änderungen seit April + Arbeitsstruktur (CLAUDE.md, ROADMAP.md, PROGRESS.md, Autopilot)

6 Wochen uncommittete Arbeit (Voice-Channels, LiveKit-Manager, Settings-Modal u.v.m.)
als ein WIP-Commit gesichert, damit nichts verloren geht und der Pi den aktuellen
Stand klonen kann. Thematische Aufarbeitung: siehe ROADMAP M0.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CPrAGBxBT6GfPXzeWQ4AXb

lib/core/e2ee_diagnostics.dart

@@ -0,0 +1,83 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+class E2eeDiagEntry {
+  final DateTime timestamp;
+  final String roomId;
+  final String eventId;
+  final String sessionId;
+  final String error;
+
+  const E2eeDiagEntry({
+    required this.timestamp,
+    required this.roomId,
+    required this.eventId,
+    required this.sessionId,
+    required this.error,
+  });
+
+  Map<String, dynamic> toJson() => {
+        'ts': timestamp.toIso8601String(),
+        'room': roomId,
+        'event': eventId,
+        'session': sessionId,
+        'error': error,
+      };
+}
+
+class E2eeDiagnosticsNotifier extends Notifier<List<E2eeDiagEntry>> {
+  static const int _maxEntries = 500;
+
+  @override
+  List<E2eeDiagEntry> build() => [];
+
+  void add(E2eeDiagEntry entry) {
+    final next = [...state, entry];
+    state = next.length > _maxEntries ? next.sublist(next.length - _maxEntries) : next;
+  }
+
+  void clear() => state = [];
+
+  Future<String> upload({required String serverUrl, required String token}) async {
+    if (state.isEmpty) return 'Keine Diagnosedaten vorhanden.';
+
+    final payload = utf8.encode(jsonEncode({
+      'client': 'Pyramid',
+      'uploaded_at': DateTime.now().toIso8601String(),
+      'entry_count': state.length,
+      'entries': state.map((e) => e.toJson()).toList(),
+    }));
+
+    final client = HttpClient();
+    try {
+      final uri = Uri.parse('$serverUrl/api/e2ee-diagnostics');
+      final request = await client.postUrl(uri);
+      request.headers.set('Content-Type', 'application/json; charset=utf-8');
+      request.headers.set('Authorization', 'Bearer $token');
+      request.headers.contentLength = payload.length;
+      request.add(payload);
+      final response = await request.close();
+      await response.drain<void>();
+      if (response.statusCode == 200) {
+        final count = state.length;
+        clear();
+        return '$count Einträge hochgeladen und lokal gelöscht.';
+      }
+      return 'Server-Fehler: HTTP ${response.statusCode}';
+    } on SocketException catch (e) {
+      return 'Netzwerkfehler: ${e.message}';
+    } catch (e) {
+      return 'Fehler: $e';
+    } finally {
+      client.close();
+    }
+  }
+}
+
+final e2eeDiagnosticsProvider =
+    NotifierProvider<E2eeDiagnosticsNotifier, List<E2eeDiagEntry>>(
+  E2eeDiagnosticsNotifier.new,
+);