重构并拆分项目

service/migrations/20260601000005_user_memories.sql

@@ -0,0 +1,9 @@
+-- 长期记忆表
+CREATE TABLE IF NOT EXISTS user_memories (
+    id SERIAL PRIMARY KEY,
+    user_id TEXT NOT NULL DEFAULT 'default',
+    content TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_user_memories_user ON user_memories (user_id);