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

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+"""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()

alembic/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

alembic/versions/2026_05_31_0000-0001_initial_initial_baseline.py

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+"""initial baseline
+
+Revision ID: 0001_initial
+Revises:
+Create Date: 2026-05-31 00:00:00
+
+这是 Alembic 接入时的占位 baseline。
+
+- 全新部署：``alembic upgrade head`` 会跑过这条 no-op，
+  然后由后续 ``alembic revision --autogenerate`` 生成真正的建表脚本，
+  或在首次部署时由应用 ``Base.metadata.create_all`` 直接建表，再 ``alembic stamp head``。
+- 已有数据库：直接 ``alembic stamp 0001_initial`` 标定基线，再做后续 autogenerate。
+"""
+
+from typing import Sequence, Union
+
+
+revision: str = "0001_initial"
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    pass
+
+
+def downgrade() -> None:
+    pass

alembic/versions/README.md

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+# Alembic versions
+
+迁移脚本会被自动生成到这个目录。
+
+常用命令（在项目根目录运行）：
+
+- 生成 baseline（首次接入，已有数据库）：
+  `alembic stamp head`
+
+- 自动检测 ORM 与 DB 差异并生成迁移：
+  `alembic revision --autogenerate -m "your message"`
+
+- 应用所有未执行的迁移：
+  `alembic upgrade head`
+
+- 回滚一个版本：
+  `alembic downgrade -1`
+
+- 查看历史：
+  `alembic history --verbose`