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_settings_models.go

@@ -0,0 +1,70 @@
+package service
+
+// Ops settings models stored in DB `settings` table (JSON blobs).
+
+type OpsEmailNotificationConfig struct {
+	Alert  OpsEmailAlertConfig  `json:"alert"`
+	Report OpsEmailReportConfig `json:"report"`
+}
+
+type OpsEmailAlertConfig struct {
+	Enabled               bool     `json:"enabled"`
+	Recipients            []string `json:"recipients"`
+	MinSeverity           string   `json:"min_severity"`
+	RateLimitPerHour      int      `json:"rate_limit_per_hour"`
+	BatchingWindowSeconds int      `json:"batching_window_seconds"`
+	IncludeResolvedAlerts bool     `json:"include_resolved_alerts"`
+}
+
+type OpsEmailReportConfig struct {
+	Enabled                         bool     `json:"enabled"`
+	Recipients                      []string `json:"recipients"`
+	DailySummaryEnabled             bool     `json:"daily_summary_enabled"`
+	DailySummarySchedule            string   `json:"daily_summary_schedule"`
+	WeeklySummaryEnabled            bool     `json:"weekly_summary_enabled"`
+	WeeklySummarySchedule           string   `json:"weekly_summary_schedule"`
+	ErrorDigestEnabled              bool     `json:"error_digest_enabled"`
+	ErrorDigestSchedule             string   `json:"error_digest_schedule"`
+	ErrorDigestMinCount             int      `json:"error_digest_min_count"`
+	AccountHealthEnabled            bool     `json:"account_health_enabled"`
+	AccountHealthSchedule           string   `json:"account_health_schedule"`
+	AccountHealthErrorRateThreshold float64  `json:"account_health_error_rate_threshold"`
+}
+
+// OpsEmailNotificationConfigUpdateRequest allows partial updates, while the
+// frontend can still send the full config shape.
+type OpsEmailNotificationConfigUpdateRequest struct {
+	Alert  *OpsEmailAlertConfig  `json:"alert"`
+	Report *OpsEmailReportConfig `json:"report"`
+}
+
+type OpsDistributedLockSettings struct {
+	Enabled    bool   `json:"enabled"`
+	Key        string `json:"key"`
+	TTLSeconds int    `json:"ttl_seconds"`
+}
+
+type OpsAlertSilenceEntry struct {
+	RuleID     *int64   `json:"rule_id,omitempty"`
+	Severities []string `json:"severities,omitempty"`
+
+	UntilRFC3339 string `json:"until_rfc3339"`
+	Reason       string `json:"reason"`
+}
+
+type OpsAlertSilencingSettings struct {
+	Enabled bool `json:"enabled"`
+
+	GlobalUntilRFC3339 string `json:"global_until_rfc3339"`
+	GlobalReason       string `json:"global_reason"`
+
+	Entries []OpsAlertSilenceEntry `json:"entries,omitempty"`
+}
+
+type OpsAlertRuntimeSettings struct {
+	EvaluationIntervalSeconds int `json:"evaluation_interval_seconds"`
+
+	DistributedLock OpsDistributedLockSettings `json:"distributed_lock"`
+	Silencing       OpsAlertSilencingSettings  `json:"silencing"`
+}
+