fix(db): 補全 metadata model import 與 realtime sales ORM

ADR-017 Phase 3f-0

database/ai_models.py

@@ -1,14 +1,3 @@
-# database/ai_models.py
-# ⚠️  這四個 class 的原始定義已移至 autoheal_models.py（ADR-013 統一管理）。
-# 此檔僅作向後相容 re-export shim，不再重複定義 SQLAlchemy Table，
-# 以避免 "Table already defined for this MetaData instance" 衝突。
-from .autoheal_models import (  # noqa: F401
-    AgentContext,
-    ActionPlan,
-    ActionOutcome,
-    AgentStrategyWeights,
-)
-
 # AI history and template models
 from sqlalchemy import Column, Integer, String, DateTime, Text, Boolean, Float
 from database.models import Base
@@ -163,6 +152,5 @@ class AIInsight(Base):
 
 
 __all__ = [
-    "AgentContext", "ActionPlan", "ActionOutcome", "AgentStrategyWeights",
     "AIGenerationHistory", "AIPromptTemplate", "AIUsageTracking", "AIInsight",
 ]