refactor(gencode): 重构代码生成模块，优化模板和查询逻辑

重构代码生成模块的模板文件，统一命名规范为下划线风格
优化GenTableQueryParam查询参数类，移除不必要的字段
修复SQLite数据库支持问题，改进表结构查询逻辑
添加数据验证处理，防止空值导致的异常
改进批量生成代码时的错误处理和参数校验

backend/templates/python/param.py.j2

@@ -6,14 +6,14 @@ from fastapi import Query
 
 from app.core.validator import DateTimeStr
 
-class {{ tableName|snake_to_pascal_case }}QueryParam:
-    """{{ functionName }}查询参数"""
+class {{ table_name|snake_to_pascal_case }}QueryParam:
+    """{{ function_name }}查询参数"""
 
     def __init__(
         self,
         {% for column in columns %}
-        {% if column.queryType == 'LIKE' %}
-        {{ column.columnName }}: Optional[{{ column.pythonType }}] = Query(None, description="{{ column.columnComment }}"),
+        {% if column.query_type == 'LIKE' %}
+        {{ column.column_name }}: Optional[{{ column.python_type }}] = Query(None, description="{{ column.column_comment }}"),
         {% endif %}
         {% endfor %}
         start_time: Optional[DateTimeStr] = Query(None, description="开始时间", example="2025-01-01 00:00:00"),
@@ -24,8 +24,8 @@ class {{ tableName|snake_to_pascal_case }}QueryParam:
         
         # 模糊查询字段
         {% for column in columns %}
-        {% if column.queryType == 'LIKE' %}
-        self.{{ column.columnName }} = ("like", {{ column.columnName }})
+        {% if column.query_type == 'LIKE' %}
+        self.{{ column.column_name }} = ("like", {{ column.column_name }})
         {% endif %}
         {% endfor %}