fix(db): 補建 ai_insights / action_plans 表

這兩張表從未存在於生產 DB，導致：
- Code Review 每次 _save_to_db() 靜默失敗
- get_history() 永遠返回空陣列
- /code-review/ 頁面歷史永遠空白

已直接在 production DB 執行 CREATE TABLE；
同步更新 docker/postgres/init/01-init.sql，
確保未來重建 DB 時自動建表。

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

docker/postgres/init/01-init.sql

@@ -56,6 +56,33 @@ CREATE TABLE IF NOT EXISTS products (
     updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
 );
 
+-- AI Insights — Code Review / Strategy / 洞察結果
+CREATE TABLE IF NOT EXISTS ai_insights (
+    id SERIAL PRIMARY KEY,
+    insight_type VARCHAR(100) NOT NULL,
+    content TEXT,
+    confidence FLOAT DEFAULT 0.0,
+    created_by VARCHAR(100),
+    status VARCHAR(50) DEFAULT 'active',
+    metadata_json TEXT,
+    period VARCHAR(20),
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+CREATE INDEX IF NOT EXISTS idx_ai_insights_type    ON ai_insights(insight_type);
+CREATE INDEX IF NOT EXISTS idx_ai_insights_created ON ai_insights(created_at DESC);
+
+-- Action Plans — Code Review 修復 / AIOps 派遣
+CREATE TABLE IF NOT EXISTS action_plans (
+    id SERIAL PRIMARY KEY,
+    action_type VARCHAR(100) NOT NULL,
+    description TEXT,
+    status VARCHAR(50) DEFAULT 'pending',
+    priority INTEGER DEFAULT 3,
+    metadata_json TEXT,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+CREATE INDEX IF NOT EXISTS idx_action_plans_type ON action_plans(action_type);
+
 -- 授權給 momo 用戶
 GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO momo;
 GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA public TO momo;