feat(failover+dispatcher): 補齊 unstaged 服務變更

- callback_dispatcher: params 型別放寬支援 numeric
- failover_alerter: alert TTL 修正
- model_version_tracker: 小調整

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/api/src/services/model_version_tracker.py

@@ -77,6 +77,15 @@ class ModelVersionTracker:
                 changed=changed_providers,
                 total_probed=len(results),
             )
+            # P3.2.3: Telegram 告警（dedup 1h/provider）
+            try:
+                from src.services.failover_alerter import get_failover_alerter
+                await get_failover_alerter().alert_provider_version_changed(
+                    changed_providers=changed_providers,
+                    probed=len(results),
+                )
+            except Exception as _alert_err:
+                logger.warning("provider_version_alert_failed", error=str(_alert_err))
         else:
             logger.info(
                 "provider_version_stable",