refactor(schema): 移除重复的模型验证逻辑并简化字段验证

统一移除各模块schema中重复的model_validator前置处理逻辑，改用更简洁的字段验证方式
优化字段验证逻辑，移除冗余的字符串处理和类型转换代码

backend/app/api/v1/module_system/params/schema.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from typing import Optional
-from pydantic import BaseModel, ConfigDict, Field, field_validator, model_validator
+from pydantic import BaseModel, ConfigDict, Field, field_validator
 
 from app.core.base_schema import BaseSchema
 
@@ -15,33 +15,6 @@ class ParamsCreateSchema(BaseModel):
     status: bool = Field(default=True, description="状态(True:正常 False:停用)")
     description: Optional[str] = Field(default=None, max_length=500, description="描述")
 
-    @model_validator(mode='before')
-    @classmethod
-    def _normalize(cls, data):
-        """前置归一化：字符串去空格、空串转 None、布尔兼容转换，并规范键为小写。"""
-        if isinstance(data, dict):
-            for key in ('config_name', 'config_key', 'config_value', 'description'):
-                val = data.get(key)
-                if isinstance(val, str):
-                    val = val.strip()
-                    if key in ('config_value', 'description') and val == '':
-                        val = None
-                    data[key] = val
-            # 规范键为小写
-            if isinstance(data.get('config_key'), str):
-                data['config_key'] = data['config_key'].lower()
-            # 规范布尔
-            for bkey in ('config_type', 'status'):
-                val = data.get(bkey)
-                if isinstance(val, str):
-                    lowered = val.strip().lower()
-                    if lowered in {'true', '1', 'y', 'yes'}:
-                        data[bkey] = True
-                    elif lowered in {'false', '0', 'n', 'no'}:
-                        data[bkey] = False
-                elif isinstance(val, int):
-                    data[bkey] = bool(val)
-        return data
 
     @field_validator('config_key')
     @classmethod