feat(shop-role): 实现店铺角色继承功能和权限检查优化

- 新增店铺角色管理 API 和数据模型
- 实现角色继承和权限检查逻辑
- 添加流程测试框架和集成测试
- 更新权限服务和账号管理逻辑
- 添加数据库迁移脚本
- 归档 OpenSpec 变更文档

Ultraworked with Sisyphus

flow_tests/core/database.py

@@ -0,0 +1,69 @@
+import logging
+from typing import Any, List, Optional
+
+import psycopg2
+from psycopg2.extras import RealDictCursor
+
+from config.settings import settings
+
+logger = logging.getLogger(__name__)
+
+
+class Database:
+    _instance: Optional['Database'] = None
+    _conn = None
+    
+    def __new__(cls):
+        if cls._instance is None:
+            cls._instance = super().__new__(cls)
+            cls._instance._connect()
+        return cls._instance
+    
+    def _connect(self):
+        config = settings.db_config
+        self._conn = psycopg2.connect(
+            host=config["host"],
+            port=config["port"],
+            database=config["database"],
+            user=config["user"],
+            password=config["password"],
+            cursor_factory=RealDictCursor,
+        )
+        self._conn.autocommit = True
+        logger.info(f"数据库连接成功: {config['host']}:{config['port']}/{config['database']}")
+    
+    def query(self, sql: str, params: tuple = ()) -> List[dict]:
+        with self._conn.cursor() as cur:
+            cur.execute(sql, params)
+            return cur.fetchall()
+    
+    def query_one(self, sql: str, params: tuple = ()) -> Optional[dict]:
+        rows = self.query(sql, params)
+        return rows[0] if rows else None
+    
+    def scalar(self, sql: str, params: tuple = ()) -> Any:
+        with self._conn.cursor() as cur:
+            cur.execute(sql, params)
+            row = cur.fetchone()
+            if row:
+                return list(row.values())[0]
+            return None
+    
+    def execute(self, sql: str, params: tuple = ()) -> int:
+        with self._conn.cursor() as cur:
+            cur.execute(sql, params)
+            return cur.rowcount
+    
+    def execute_many(self, sql: str, params_list: List[tuple]) -> int:
+        with self._conn.cursor() as cur:
+            cur.executemany(sql, params_list)
+            return cur.rowcount
+    
+    def close(self):
+        if self._conn:
+            self._conn.close()
+            logger.info("数据库连接已关闭")
+
+
+def get_db() -> Database:
+    return Database()