update:1.重构项目数据库初始化和迁移逻辑，使用Alembic数据库管理工具

backend/alembic-sqlite.ini

@@ -0,0 +1,48 @@
+# Alembic Database Migration Profile - SQLite
+# Database version management for the MuMuAINovel project
+
+[alembic]
+# Migration Script storage directory (SQLite)
+script_location = alembic/sqlite
+
+# Template File Path (for generating migration scripts)
+file_template = %%(year)d%%(month).2d%%(day).2d_%%(hour).2d%%(minute).2d_%%(rev)s_%%(slug)s
+
+# Database connection string
+# Note: The actual connection string is read from the environment variable in env.py
+# sqlalchemy.url = sqlite+aiosqlite:///data/ai_story.db
+
+# Log Configuration
+[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