feat: integrate Elephant Alpha ecosystem with full ADR-012/013 compliance

- Add ElephantService, AutonomousEngine, Orchestrator, DecisionRouter (EA 4-file stack)
- Fix 10 bugs: URL typo, SQL schema mismatches (price_records JOIN), enum mapping,
  metadata_json, NemoTron PriceThreat dispatch, async/await mismatch, broken imports
- Wire ADR-012 Agent Action Ladder: EventRouter L2 → EA first + AIOrch fallback;
  all decisions dual-write DB + triaged_alert Telegram; momo: callback prefix
- Wire ADR-013 AutoHeal: resource_optimization trigger → AutoHealService
- Add W3 guards: connection cache 300s TTL, $5/hr cost hard limit
- Add W4 persistence: routing decisions + agent performance snapshots → ai_insights
- Add Migration 015: confidence + created_by columns on ai_insights
- Fix run_scheduler.py broken imports (DecisionTracker service didn't exist)
- Fix verify_elephant_integration.py: check_status() → check_connection()

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

migrations/015_ai_insights_elephant_alpha.sql

@@ -0,0 +1,29 @@
+-- =============================================================================
+-- Migration 015: Elephant Alpha ai_insights 補齊欄位
+-- MOMO PRO — Elephant Alpha Super Orchestrator
+-- 2026-04-20 台北
+-- =============================================================================
+-- 說明:
+--   Elephant Alpha (_log_decision / _escalate_to_human) 需要兩個欄位：
+--     - confidence : API 回應信心分（0.0~1.0），語意不同於 avg_quality（時間衰減分）
+--     - created_by : 發起 Agent 名稱 ('elephant_alpha' / 'hermes' / ...)
+--                    語意不同於 ai_model（模型字串），混用會破壞 RAG 查詢
+--
+-- 執行方式:
+--   psql -U momo -d momo_pro -f migrations/015_ai_insights_elephant_alpha.sql
+-- =============================================================================
+
+ALTER TABLE ai_insights
+    ADD COLUMN IF NOT EXISTS confidence   FLOAT        DEFAULT 0.5,
+    ADD COLUMN IF NOT EXISTS created_by   VARCHAR(50)  DEFAULT 'system';
+
+CREATE INDEX IF NOT EXISTS idx_ai_insights_created_by
+    ON ai_insights(created_by);
+
+CREATE INDEX IF NOT EXISTS idx_ai_insights_confidence
+    ON ai_insights(confidence);
+
+DO $$
+BEGIN
+    RAISE NOTICE '✅ Migration 015 完成 — ai_insights 已新增 confidence / created_by 欄位';
+END $$;