feat(数据库): 添加运维监控数据模型和数据库迁移脚本

- 新增 ops 监控数据库迁移脚本（表结构定义）
- 定义核心数据模型（ops_models.go）
- 定义告警相关模型（ops_alert_models.go）
- 定义仪表板数据模型（ops_dashboard_models.go）
- 定义实时监控数据模型（ops_realtime_models.go）
- 定义配置相关模型（ops_settings_models.go）
- 定义趋势分析数据模型（ops_trend_models.go）

backend/internal/service/ops_realtime_models.go

@@ -0,0 +1,81 @@
+package service
+
+import "time"
+
+// PlatformConcurrencyInfo aggregates concurrency usage by platform.
+type PlatformConcurrencyInfo struct {
+	Platform       string  `json:"platform"`
+	CurrentInUse   int64   `json:"current_in_use"`
+	MaxCapacity    int64   `json:"max_capacity"`
+	LoadPercentage float64 `json:"load_percentage"`
+	WaitingInQueue int64   `json:"waiting_in_queue"`
+}
+
+// GroupConcurrencyInfo aggregates concurrency usage by group.
+//
+// Note: one account can belong to multiple groups; group totals are therefore not additive across groups.
+type GroupConcurrencyInfo struct {
+	GroupID        int64   `json:"group_id"`
+	GroupName      string  `json:"group_name"`
+	Platform       string  `json:"platform"`
+	CurrentInUse   int64   `json:"current_in_use"`
+	MaxCapacity    int64   `json:"max_capacity"`
+	LoadPercentage float64 `json:"load_percentage"`
+	WaitingInQueue int64   `json:"waiting_in_queue"`
+}
+
+// AccountConcurrencyInfo represents real-time concurrency usage for a single account.
+type AccountConcurrencyInfo struct {
+	AccountID      int64   `json:"account_id"`
+	AccountName    string  `json:"account_name"`
+	Platform       string  `json:"platform"`
+	GroupID        int64   `json:"group_id"`
+	GroupName      string  `json:"group_name"`
+	CurrentInUse   int64   `json:"current_in_use"`
+	MaxCapacity    int64   `json:"max_capacity"`
+	LoadPercentage float64 `json:"load_percentage"`
+	WaitingInQueue int64   `json:"waiting_in_queue"`
+}
+
+// PlatformAvailability aggregates account availability by platform.
+type PlatformAvailability struct {
+	Platform       string `json:"platform"`
+	TotalAccounts  int64  `json:"total_accounts"`
+	AvailableCount int64  `json:"available_count"`
+	RateLimitCount int64  `json:"rate_limit_count"`
+	ErrorCount     int64  `json:"error_count"`
+}
+
+// GroupAvailability aggregates account availability by group.
+type GroupAvailability struct {
+	GroupID        int64  `json:"group_id"`
+	GroupName      string `json:"group_name"`
+	Platform       string `json:"platform"`
+	TotalAccounts  int64  `json:"total_accounts"`
+	AvailableCount int64  `json:"available_count"`
+	RateLimitCount int64  `json:"rate_limit_count"`
+	ErrorCount     int64  `json:"error_count"`
+}
+
+// AccountAvailability represents current availability for a single account.
+type AccountAvailability struct {
+	AccountID   int64  `json:"account_id"`
+	AccountName string `json:"account_name"`
+	Platform    string `json:"platform"`
+	GroupID     int64  `json:"group_id"`
+	GroupName   string `json:"group_name"`
+
+	Status string `json:"status"`
+
+	IsAvailable   bool `json:"is_available"`
+	IsRateLimited bool `json:"is_rate_limited"`
+	IsOverloaded  bool `json:"is_overloaded"`
+	HasError      bool `json:"has_error"`
+
+	RateLimitResetAt       *time.Time `json:"rate_limit_reset_at"`
+	RateLimitRemainingSec  *int64     `json:"rate_limit_remaining_sec"`
+	OverloadUntil          *time.Time `json:"overload_until"`
+	OverloadRemainingSec   *int64     `json:"overload_remaining_sec"`
+	ErrorMessage           string     `json:"error_message"`
+	TempUnschedulableUntil *time.Time `json:"temp_unschedulable_until,omitempty"`
+}