初始提交：项目基础结构

- backend: FastAPI 后端服务 (Python)
- frontend: React + Tauri 前端应用
- docker-compose.yml: 容器编排配置

backend/alembic/README

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+Generic single-database configuration.

backend/alembic/env.py

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+"""Alembic 迁移环境配置 — 异步引擎 + 自动加载模型"""
+import asyncio
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy.ext.asyncio import create_async_engine
+
+from app.core.config import settings
+from app.models import Base  # 自动发现所有 SQLAlchemy 模型
+
+# Alembic Config 对象
+config = context.config
+
+# 日志配置
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# 将 DATABASE_URL 同步到 alembic 配置中（覆盖 alembic.ini 中的占位值）
+config.set_main_option("sqlalchemy.url", settings.DATABASE_URL)
+
+# 自动生成迁移时需要的 models 元数据
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    """离线模式：生成 SQL 脚本而非直接执行"""
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection):
+    """在线模式：通过数据库连接执行迁移"""
+    context.configure(connection=connection, target_metadata=target_metadata)
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_migrations_online() -> None:
+    """在线模式：异步引擎"""
+    connectable = create_async_engine(
+        config.get_main_option("sqlalchemy.url"),
+        echo=settings.DEBUG,
+    )
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+    await connectable.dispose()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    asyncio.run(run_migrations_online())

backend/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, Sequence[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:
+    """Upgrade schema."""
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    ${downgrades if downgrades else "pass"}