feat(g0v0-migrate): implement g0v0 migration system with plugin support (#97)

For details please view the PR.

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

packages/g0v0-migrations/g0v0_migrations/model.py

@@ -0,0 +1,51 @@
+from pathlib import Path
+from typing import Annotated, TypedDict
+
+from alembic.config import Config as AlembicConfig
+from pydantic import Field
+from pydantic_settings import BaseSettings
+from pydantic_settings.main import SettingsConfigDict
+
+
+class G0v0ServerDatabaseConfig(BaseSettings):
+    model_config: SettingsConfigDict = SettingsConfigDict(
+        extra="ignore",
+        env_file_encoding="utf-8",
+    )
+
+    mysql_host: Annotated[
+        str,
+        Field(default="localhost", description="MySQL 服务器地址"),
+        "数据库设置",
+    ]
+    mysql_port: Annotated[
+        int,
+        Field(default=3306, description="MySQL 服务器端口"),
+        "数据库设置",
+    ]
+    mysql_database: Annotated[
+        str,
+        Field(default="osu_api", description="MySQL 数据库名称"),
+        "数据库设置",
+    ]
+    mysql_user: Annotated[
+        str,
+        Field(default="osu_api", description="MySQL 用户名"),
+        "数据库设置",
+    ]
+    mysql_password: Annotated[
+        str,
+        Field(default="password", description="MySQL 密码"),
+        "数据库设置",
+    ]
+
+    @property
+    def database_url(self) -> str:
+        return f"mysql+aiomysql://{self.mysql_user}:{self.mysql_password}@{self.mysql_host}:{self.mysql_port}/{self.mysql_database}"
+
+
+class ContextObject(TypedDict):
+    g0v0_server_path: Path
+    plugin_path: Path
+    alembic_config: AlembicConfig
+    plugin_id: str | None