feat: 添加数据模型和存储层

- model: JobTemplate、SubmitJobRequest、JobHistoryQuery 等模型定义

- store: NewGormDB MySQL 连接池，使用 zap 日志替代 GORM 默认日志

- store: TemplateStore CRUD 操作，支持 GORM AutoMigrate

- NewGormDB 接受 gormLevel 参数，由上层传入配置值

- 完整 TDD 测试覆盖

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

internal/model/cluster.go

@@ -0,0 +1,23 @@
+package model
+
+// NodeResponse is the simplified API response for a node.
+type NodeResponse struct {
+	Name       string   `json:"name"`
+	State      []string `json:"state"`
+	CPUs       int32    `json:"cpus"`
+	RealMemory int64    `json:"real_memory"`
+	AllocMem   int64    `json:"alloc_memory,omitempty"`
+	Arch       string   `json:"architecture,omitempty"`
+	OS         string   `json:"operating_system,omitempty"`
+}
+
+// PartitionResponse is the simplified API response for a partition.
+type PartitionResponse struct {
+	Name       string   `json:"name"`
+	State      []string `json:"state"`
+	Nodes      string   `json:"nodes,omitempty"`
+	TotalCPUs  int32    `json:"total_cpus,omitempty"`
+	TotalNodes int32    `json:"total_nodes,omitempty"`
+	MaxTime    string   `json:"max_time,omitempty"`
+	Default    bool     `json:"default,omitempty"`
+}