feat: Phase 3 - 工具层 + 测试 + 数据库迁移

migrations/alembic.ini

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+[alembic]
+# 脚本位置
+script_location = migrations
+
+# 模板文件
+template_file = 
+
+# 最大保留版本数
+max_num = 10
+
+# 数据库 URL（运行时覆盖）
+sqlalchemy.url = sqlite:///pit_router.db
+
+[post_write_hooks]
+
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S