feat: implement base architecture and core repositories for weapon tracking and target analysis functionality

lib/features/session/session_provider.dart

@@ -0,0 +1,51 @@
+import 'package:flutter/foundation.dart';
+import '../../data/models/session.dart';
+import '../../data/models/target_analysis.dart';
+import '../../data/models/weapon.dart';
+
+class SessionProvider extends ChangeNotifier {
+  String? _currentWeaponName;
+  String? _currentWeaponId;
+  int _shotsPerTarget = 5;
+  int _distance = 25;
+  String? _activeSessionId;
+  final List<TargetAnalysis> _currentAnalyses = [];
+  bool _isSessionActive = false;
+
+  String? get currentWeapon => _currentWeaponName;
+  String? get currentWeaponId => _currentWeaponId;
+  int get shotsPerTarget => _shotsPerTarget;
+  int get distance => _distance;
+  bool get isSessionActive => _isSessionActive;
+  String? get activeSessionId => _activeSessionId;
+  List<TargetAnalysis> get currentAnalyses => List.unmodifiable(_currentAnalyses);
+  
+  int get totalSessionScore => _currentAnalyses.fold(0, (sum, a) => sum + a.totalScore);
+  int get targetCount => _currentAnalyses.length;
+
+  void startSession(String weaponName, int shots, String sessionId, {String? weaponId, int distance = 25}) {
+    _currentWeaponName = weaponName;
+    _currentWeaponId = weaponId;
+    _shotsPerTarget = shots;
+    _distance = distance;
+    _activeSessionId = sessionId;
+    _currentAnalyses.clear();
+    _isSessionActive = true;
+    notifyListeners();
+  }
+
+  void addAnalysis(TargetAnalysis analysis) {
+    _currentAnalyses.add(analysis);
+    notifyListeners();
+  }
+
+  void endSession() {
+    _isSessionActive = false;
+    _activeSessionId = null;
+    _currentWeaponId = null;
+    _currentWeaponName = null;
+    _currentAnalyses.clear();
+    _distance = 25;
+    notifyListeners();
+  }
+}