实现原料逻辑删除功能

- 为fabrics表添加is_deleted字段用于标记删除状态
- 修改delete_raw方法实现逻辑删除而非物理删除
- 更新所有查询语句过滤已删除的原料数据
- 更新库存视图过滤已删除的原料和相关记录
- 保留历史数据,支持数据恢复

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

fabric_manager_pro.py

@@ -263,7 +263,7 @@ class FabricManager(QMainWindow):
             if fabric_model:
                 try:
                     with self.get_conn() as conn:
-                        cursor = conn.execute("SELECT width, gsm FROM fabrics WHERE model = ?", (fabric_model,))
+                        cursor = conn.execute("SELECT width, gsm FROM fabrics WHERE model = ? AND (is_deleted IS NULL OR is_deleted = 0)", (fabric_model,))
                         fabric_info = cursor.fetchone()
                         if fabric_info and fabric_info[0] and fabric_info[1]:
                             width, gsm = fabric_info