feat: add webhook notification service and refactor data management

## Backend Changes
- Add WebhookService for sending alert notifications via HTTP webhooks
- Implement HMAC-SHA256 signature for webhook payload authentication
- Add webhook configuration API endpoints and settings
- Integrate webhook calls into OpsAlertEvaluatorService
- Fix routes/common.go string conversion (use strconv.Itoa)
- Add comprehensive webhook service tests

## Frontend Changes
- Add webhook notification configuration UI in OpsSettingsDialog
- Add WebhookNotificationConfig types and API functions
- Add i18n translations for webhook features (zh/en)
- Refactor DataManagementView.vue into modular components:
  - PostgresProfilesCard.vue (356 lines)
  - RedisProfilesCard.vue (331 lines)
  - S3ProfilesCard.vue (363 lines)
  - BackupJobsCard.vue (216 lines)
  - DataManagementView.vue (94 lines)
- Add OpsSettingsDialog component tests

## Testing
- All backend tests pass
- All frontend tests pass
- Webhook service tests cover signature, HTTP, timeout, error handling

frontend/src/api/admin/ops.ts

@@ -804,6 +804,25 @@ export interface EmailNotificationConfig {
   }
 }
 
+export interface WebhookNotificationConfig {
+  alert: {
+    enabled: boolean
+    urls: string[]
+    secret?: string
+    min_severity: AlertSeverity | ''
+    timeout_seconds: number
+    include_resolved: boolean
+    rate_limit_per_hour: number
+  }
+  report: {
+    enabled: boolean
+    urls: string[]
+    secret?: string
+    daily_enabled: boolean
+    daily_schedule: string
+  }
+}
+
 export interface OpsMetricThresholds {
   sla_percent_min?: number | null                 // SLA低于此值变红
   ttft_p99_ms_max?: number | null                 // TTFT P99高于此值变红
@@ -1300,6 +1319,17 @@ export async function updateEmailNotificationConfig(config: EmailNotificationCon
   return data
 }
 
+// Webhook notification config (DB-backed)
+export async function getWebhookNotificationConfig(): Promise<WebhookNotificationConfig> {
+  const { data } = await apiClient.get<WebhookNotificationConfig>('/admin/ops/webhook-notification/config')
+  return data
+}
+
+export async function updateWebhookNotificationConfig(config: WebhookNotificationConfig): Promise<WebhookNotificationConfig> {
+  const { data } = await apiClient.put<WebhookNotificationConfig>('/admin/ops/webhook-notification/config', config)
+  return data
+}
+
 // Runtime settings (DB-backed)
 export async function getAlertRuntimeSettings(): Promise<OpsAlertRuntimeSettings> {
   const { data } = await apiClient.get<OpsAlertRuntimeSettings>('/admin/ops/runtime/alert')
@@ -1407,6 +1437,8 @@ export const opsAPI = {
   createAlertSilence,
   getEmailNotificationConfig,
   updateEmailNotificationConfig,
+  getWebhookNotificationConfig,
+  updateWebhookNotificationConfig,
   getAlertRuntimeSettings,
   updateAlertRuntimeSettings,
   getRuntimeLogConfig,