Add clearTableRecordsBefore function

Implement function to clear table records from chat.

core/table-system/cleaner.js

@@ -0,0 +1,40 @@
+import { getContext, extension_settings } from '/scripts/extensions.js';
+import { saveChatDebounced } from '/script.js';
+import { log } from './logger.js';
+import { extensionName } from '../../utils/settings.js';
+
+const TABLE_DATA_KEY = 'amily2_tables_data';
+
+export async function clearTableRecordsBefore(floorIndex) {
+    const context = getContext();
+    if (!context || !context.chat || context.chat.length === 0) {
+        log('无法清除：聊天记录为空。', 'warn');
+        return 0;
+    }
+
+    let clearedCount = 0;
+    const chat = context.chat;
+    const targetIndex = Math.min(floorIndex, chat.length);
+
+    log(`开始清除第 ${targetIndex} 楼之前的表格记录...`, 'info');
+
+    for (let i = 0; i < targetIndex; i++) {
+        const message = chat[i];
+        if (message.extra && message.extra[TABLE_DATA_KEY]) {
+            delete message.extra[TABLE_DATA_KEY];
+            if (Object.keys(message.extra).length === 0) {
+                delete message.extra;
+            }
+            clearedCount++;
+        }
+    }
+
+    if (clearedCount > 0) {
+        await saveChatDebounced();
+        log(`成功清除了 ${clearedCount} 条消息中的表格记录。`, 'success');
+    } else {
+        log('没有发现需要清除的表格记录。', 'info');
+    }
+
+    return clearedCount;
+}