添加谱面用户打分（评分）相关接口 (#24)

* feat(database): 添加 beatmap_ratings 表用于用户评分

- 新增 BeatmapRating 模型类，用于表示 beatmap_ratings 表
- 该表包含 id、beatmapset_id、user_id 字段
- 建立与 Beatmapset 和 User 表的关联关系

* feat(beatmapset_ratings): 添加判断用户是否可以对谱面集进行评分的接口

- 新增 /beatmapsets/{beatmapset_id}/can_rate 接口
- 判断用户是否能对谱面集进行过评分，返回True/False

* feat(ratings): 添加为谱面评分的接口

- 新增 POST /beatmapsets/{beatmapset_id} 路由，用于用户给谱面集评分
- 实现谱面集评分的添加和更新逻辑
- 在 BeatmapRating 模型中添加 rating 字段 (漏了最重要的，我真tm丢脸)

* chore(database): 添加alembic数据库迁移脚本

* fix(ratings): 更改上传谱面打分的api路径，防止冲突

* fix(ratings): add changes from pr review

* refactor(ratings): remove swears from code

* feat(ratings): 从beatmapset中移除ratings字段，并改由从beatmap_ratings表中直接计算评分

* chore(deps): 添加 git 包并更新依赖项

- 在 builder 阶段添加了 git 包的安装

* chore(database): 更新数据库连接地址并删除意外的迁移脚本

- 将 Alembic 配置文件中的数据库连接地址从本地地址改为 Docker Compose 中的 mysql 服务地址
- 删除了 migrations/versions 目录下的 dba1f8d9992e_add_beatmap_ratings_table.py 文件

* chore(database): generate alembic script for beatmap ratings

* fix(ratings): apply changes suggested in review

- revert changes to alembic.ini
- add name to apis
- modify migration scripts

* chore: format server.py using ruff

- who forgot to do this?

* fix(migrate): fix remove achievement index

* perf(rating): optimize SQL query

* fix(rating): ensure user can rate beatmapset

* fix(rating): add boundary check

* chore(project): remove submodule

---------

Co-authored-by: MingxuanGame <MingxuanGame@outlook.com>

migrations/versions/24a32515292d_add_beatmap_ratings.py

@@ -0,0 +1,51 @@
+"""add beatmap ratings
+
+Revision ID: 24a32515292d
+Revises: af88493881eb
+Create Date: 2025-08-28 11:36:17.874090
+
+"""
+
+from __future__ import annotations
+
+from collections.abc import Sequence
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = "24a32515292d"
+down_revision: str | Sequence[str] | None = "af88493881eb"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        "beatmap_ratings",
+        sa.Column("id", sa.BigInteger(), autoincrement=True, nullable=False),
+        sa.Column("beatmapset_id", sa.Integer(), nullable=False),
+        sa.Column("user_id", sa.BigInteger(), nullable=True),
+        sa.Column("rating", sa.Integer(), nullable=False),
+        sa.ForeignKeyConstraint(
+            ["beatmapset_id"],
+            ["beatmapsets.id"],
+        ),
+        sa.ForeignKeyConstraint(
+            ["user_id"],
+            ["lazer_users.id"],
+        ),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(op.f("ix_beatmap_ratings_beatmapset_id"), "beatmap_ratings", ["beatmapset_id"], unique=False)
+    op.create_index(op.f("ix_beatmap_ratings_user_id"), "beatmap_ratings", ["user_id"], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table("beatmap_ratings")
+    # ### end Alembic commands ###