feat(system):优化后端

1.新增后端测试
2.增加了后端的加密
3.增加了i18n（国际化）

alembic/env.py

@@ -0,0 +1,97 @@
+"""Alembic 迁移环境。
+
+设计要点：
+1. 数据库 URL 从 ``POSTGRES_*`` 环境变量动态拼装，不污染 ``alembic.ini``；
+2. 复用项目本身的 ORM metadata：``BaseDataModel.metadata`` 让 autogenerate
+   能识别全部表；
+3. 与运行期保持一致使用 ``asyncpg`` 异步驱动 —— 通过 ``async_engine_from_config``
+   建立 AsyncEngine，再借 ``run_sync`` 把 alembic 的 sync migration 执行入口
+   挂载进去。这样无需额外引入 psycopg 等同步驱动。
+"""
+
+from __future__ import annotations
+
+import asyncio
+import os
+import sys
+from logging.config import fileConfig
+from pathlib import Path
+
+from alembic import context
+from sqlalchemy import pool
+from sqlalchemy.engine import Connection
+from sqlalchemy.ext.asyncio import async_engine_from_config
+
+PROJECT_ROOT = Path(__file__).resolve().parent.parent
+if str(PROJECT_ROOT) not in sys.path:
+    sys.path.insert(0, str(PROJECT_ROOT))
+
+from kilostar.core.postgres_database.model.base import BaseDataModel  # noqa: E402
+from kilostar.core.postgres_database import model as _model_pkg  # noqa: F401,E402
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+
+def _build_db_url() -> str:
+    """从 ``POSTGRES_*`` 环境变量拼装一个 asyncpg URL。"""
+    user = os.environ.get("POSTGRES_USER", "postgres")
+    password = os.environ.get("POSTGRES_PASSWORD", "postgrespassword")
+    host = os.environ.get("POSTGRES_HOST", "127.0.0.1")
+    port = os.environ.get("POSTGRES_PORT", "5432")
+    db = os.environ.get("POSTGRES_DB", "kilostar")
+    return f"postgresql+asyncpg://{user}:{password}@{host}:{port}/{db}"
+
+
+config.set_main_option("sqlalchemy.url", _build_db_url())
+
+target_metadata = BaseDataModel.metadata
+
+
+def run_migrations_offline() -> None:
+    """离线模式：不连库，直接把 SQL 渲染到 stdout。"""
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        compare_type=True,
+        compare_server_default=True,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def _do_run_migrations(connection: Connection) -> None:
+    context.configure(
+        connection=connection,
+        target_metadata=target_metadata,
+        compare_type=True,
+        compare_server_default=True,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def _run_async_migrations() -> None:
+    connectable = async_engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+    async with connectable.connect() as connection:
+        await connection.run_sync(_do_run_migrations)
+    await connectable.dispose()
+
+
+def run_migrations_online() -> None:
+    asyncio.run(_run_async_migrations())
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()