重构并拆分项目

service/migrations/20260601000006_session_summaries.sql

@@ -0,0 +1,12 @@
+-- 会话摘要持久化
+CREATE TABLE IF NOT EXISTS session_summaries (
+    id SERIAL PRIMARY KEY,
+    user_id TEXT NOT NULL DEFAULT 'default',
+    summary_text TEXT NOT NULL,
+    reason TEXT NOT NULL DEFAULT 'overflow',
+    message_count INTEGER NOT NULL DEFAULT 0,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_session_summaries_created
+    ON session_summaries (created_at DESC);