新增阅读器功能，待优化

lib/utils/database_helper.dart

@@ -57,7 +57,7 @@ class DatabaseHelper {
 
     return await openDatabase(
       path,
-      version: 13,
+      version: 14,
       onCreate: _createDB,
       onUpgrade: _onUpgrade,
     );
@@ -115,6 +115,9 @@ class DatabaseHelper {
     if (oldVersion < 13) {
       await _upgradeToV13(db);
     }
+    if (oldVersion < 14) {
+      await _createReaderBooksTable(db);
+    }
   }
 
   /// 升级books表到V11（添加ISBN和出版时间字段）
@@ -154,6 +157,26 @@ class DatabaseHelper {
     }
   }
 
+  /// 升级到V14：创建阅读器书籍表
+  Future<void> _createReaderBooksTable(Database db) async {
+    await db.execute('''
+      CREATE TABLE IF NOT EXISTS reader_books (
+        id TEXT PRIMARY KEY,
+        title TEXT NOT NULL,
+        author TEXT DEFAULT '',
+        cover_path TEXT,
+        file_path TEXT NOT NULL,
+        file_name TEXT NOT NULL,
+        file_extension TEXT NOT NULL DEFAULT 'epub',
+        last_read_cfi TEXT DEFAULT '',
+        reading_percentage REAL DEFAULT 0.0,
+        created_at TEXT NOT NULL,
+        updated_at TEXT NOT NULL,
+        is_deleted INTEGER DEFAULT 0
+      )
+    ''');
+  }
+
   /// 升级到V13：创建标签表并回填已有数据
   Future<void> _upgradeToV13(Database db) async {
     await db.execute('''
@@ -587,6 +610,24 @@ class DatabaseHelper {
         UNIQUE(name, type)
       )
     ''');
+
+    // 阅读器书籍表
+    await db.execute('''
+      CREATE TABLE IF NOT EXISTS reader_books (
+        id TEXT PRIMARY KEY,
+        title TEXT NOT NULL,
+        author TEXT DEFAULT '',
+        cover_path TEXT,
+        file_path TEXT NOT NULL,
+        file_name TEXT NOT NULL,
+        file_extension TEXT NOT NULL DEFAULT 'epub',
+        last_read_cfi TEXT DEFAULT '',
+        reading_percentage REAL DEFAULT 0.0,
+        created_at TEXT NOT NULL,
+        updated_at TEXT NOT NULL,
+        is_deleted INTEGER DEFAULT 0
+      )
+    ''');
   }
 
   // 关闭数据库