重构：完善 IoT 模型架构规范和数据库设计

- 完善 GORM 模型规范：货币字段使用 int64(分为单位)、JSONB 字段规范、模型结构规范
- 修复所有 IoT 模型的架构违规问题
- 更新 CLAUDE.md 开发指南，补充完整的数据库设计规范和模型示例
- 添加数据库迁移脚本(000006)用于架构重构
- 归档 OpenSpec 变更文档(2026-01-12-fix-iot-models-violations)

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

go.mod

@@ -32,6 +32,7 @@ require (
 
 require (
 	dario.cat/mergo v1.0.2 // indirect
+	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161 // indirect
 	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/andybalholm/brotli v1.2.0 // indirect
@@ -59,6 +60,7 @@ require (
 	github.com/go-ole/go-ole v1.2.6 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-sql-driver/mysql v1.8.1 // indirect
 	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.3 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
@@ -129,4 +131,6 @@ require (
 	google.golang.org/grpc v1.75.1 // indirect
 	google.golang.org/protobuf v1.36.10 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gorm.io/datatypes v1.2.7 // indirect
+	gorm.io/driver/mysql v1.5.6 // indirect
 )