fix(playbook): C1-C4 全流程串接 — evolver保護+seeder復活+規則即時建立+watchdog W-4

C1: playbook_evolver — yaml_rule source playbooks 加 YAML_RULE guard，
    evolver 不再封存 seeder 建立的 APPROVED playbook，保護自動修復鏈路

C2: playbook_seed_service — idempotency SQL 排除 DEPRECATED 記錄，
    evolver 封存後重啟可復活 yaml_rule playbooks

C3: alert_rule_engine — AI 自動生成規則成功後立即呼叫 seed_playbooks_from_rules()，
    不等下次重啟即可建立對應 APPROVED Playbook

C4: ai_slo_watchdog_job — 新增 W-4 APPROVED playbook 數量為 0 告警，
    鏈路斷裂立即 TYPE-8M；total checks 由 3 升為 4

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

apps/api/src/services/alert_rule_engine.py

@@ -716,6 +716,10 @@ async def auto_generate_rule(
         success = _append_rule_to_yaml(yaml_block, alertname_safe)
         if success:
             logger.info("auto_rule_success", alertname=alertname_safe, rule_id=rule_id)
+            # 立即為新規則建立 APPROVED Playbook（不等下次重啟）
+            import asyncio as _asyncio
+            from src.services.playbook_seed_service import seed_playbooks_from_rules
+            _asyncio.create_task(seed_playbooks_from_rules())
         else:
             logger.warning("auto_rule_failed_validation", alertname=alertname_safe)