feat:添加各种边界测试

Author: rockyshi1993

lib/model/index.js

@@ -90,6 +90,14 @@ class Model {
                 throw err;
             }
 
+            // 检查特殊字符（MongoDB 集合名不允许包含 $, ., 空格, null 字符等）
+            const invalidChars = /[$.\s\x00]/;
+            if (invalidChars.test(collectionName)) {
+                const err = new Error('Invalid collection name: contains special characters ($, ., space, or null character).');
+                err.code = 'INVALID_COLLECTION_NAME';
+                throw err;
+            }
+
             if (!definition || typeof definition !== 'object') {
                 const err = new Error('Model definition must be an object.');
                 err.code = 'INVALID_MODEL_DEFINITION';