chore: bootstrap flutter reader app skeleton

lib/core/network/api_client.dart

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+import 'package:dio/dio.dart';
+
+import '../storage/secure_store.dart';
+
+class ApiClient {
+  ApiClient({
+    required String baseUrl,
+    required SecureStore secureStore,
+  })  : _secureStore = secureStore,
+        dio = Dio(
+          BaseOptions(
+            baseUrl: baseUrl,
+            connectTimeout: const Duration(seconds: 20),
+            receiveTimeout: const Duration(seconds: 20),
+            headers: const {'Content-Type': 'application/json'},
+          ),
+        ) {
+    dio.interceptors.add(
+      InterceptorsWrapper(
+        onRequest: (options, handler) async {
+          final token = await _secureStore.getAccessToken();
+          if (token != null && token.isNotEmpty) {
+            options.headers['Authorization'] = 'Bearer $token';
+          }
+          handler.next(options);
+        },
+      ),
+    );
+  }
+
+  final Dio dio;
+  final SecureStore _secureStore;
+}

lib/core/storage/local_store.dart

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+import 'package:shared_preferences/shared_preferences.dart';
+
+class LocalStore {
+  static const _kFontSize = 'reader_font_size';
+  static const _kLineHeight = 'reader_line_height';
+  static const _kLetterSpacing = 'reader_letter_spacing';
+  static const _kFontFamily = 'reader_font_family';
+
+  Future<void> saveReadingSettings({
+    required double fontSize,
+    required double lineHeight,
+    required double letterSpacing,
+    required String fontFamily,
+  }) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setDouble(_kFontSize, fontSize);
+    await prefs.setDouble(_kLineHeight, lineHeight);
+    await prefs.setDouble(_kLetterSpacing, letterSpacing);
+    await prefs.setString(_kFontFamily, fontFamily);
+  }
+
+  Future<Map<String, dynamic>> getReadingSettings() async {
+    final prefs = await SharedPreferences.getInstance();
+    return {
+      'fontSize': prefs.getDouble(_kFontSize) ?? 18,
+      'lineHeight': prefs.getDouble(_kLineHeight) ?? 1.8,
+      'letterSpacing': prefs.getDouble(_kLetterSpacing) ?? 0,
+      'fontFamily': prefs.getString(_kFontFamily) ?? 'serif',
+    };
+  }
+}

lib/core/storage/secure_store.dart

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+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+
+class SecureStore {
+  SecureStore() : _storage = const FlutterSecureStorage();
+
+  static const _kAccessToken = 'access_token';
+  static const _kRefreshToken = 'refresh_token';
+
+  final FlutterSecureStorage _storage;
+
+  Future<void> setAccessToken(String token) =>
+      _storage.write(key: _kAccessToken, value: token);
+
+  Future<String?> getAccessToken() => _storage.read(key: _kAccessToken);
+
+  Future<void> setRefreshToken(String token) =>
+      _storage.write(key: _kRefreshToken, value: token);
+
+  Future<String?> getRefreshToken() => _storage.read(key: _kRefreshToken);
+
+  Future<void> clear() => _storage.deleteAll();
+}

lib/core/theme/app_theme.dart

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+import 'package:flutter/material.dart';
+
+class AppTheme {
+  AppTheme._();
+
+  static final ThemeData lightTheme = ThemeData(
+    useMaterial3: true,
+    colorScheme: ColorScheme.fromSeed(
+      seedColor: const Color(0xFF155DFC),
+      brightness: Brightness.light,
+    ),
+    scaffoldBackgroundColor: const Color(0xFFF7F9FC),
+    appBarTheme: const AppBarTheme(
+      centerTitle: false,
+      backgroundColor: Color(0xFFF7F9FC),
+      foregroundColor: Color(0xFF121826),
+    ),
+  );
+}