feat(custom-rulesets): support custom rulesets (#23)

* feat(custom_ruleset): add custom rulesets support

* feat(custom-ruleset): add version check

* feat(custom-ruleset): add LegacyIO API to get ruleset hashes

* feat(pp): add check for rulesets whose pp cannot be calculated

* docs(readme): update README to include support for custom rulesets

* fix(custom-ruleset): make `rulesets` empty instead of throw a error when version check is disabled

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

* chore(custom-ruleset): apply the latest changes of generator

c891bcd159

and

e25041ad3b

* feat(calculator): add fallback performance calculation for unsupported modes

* fix(calculator): remove debug print

* fix: resolve reviews

* feat(calculator): add difficulty calculation checks

---------

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

app/config.py

@@ -536,6 +536,11 @@ CALCULATOR_CONFIG='{
         ),
         "表现计算设置",
     ]
+    fallback_no_calculator_pp: Annotated[
+        bool,
+        Field(default=False, description="当计算器不支持某个模式时，使用简化的 pp 计算方法作为后备"),
+        "表现计算设置",
+    ]
 
     # 谱面缓存设置
     enable_beatmap_preload: Annotated[
@@ -687,6 +692,11 @@ CALCULATOR_CONFIG='{
         Field(default=False, description="允许用户删除自己的成绩"),
         "反作弊设置",
     ]
+    check_ruleset_version: Annotated[
+        bool,
+        Field(default=True, description="检查自定义 ruleset 版本"),
+        "反作弊设置",
+    ]
 
     # 存储设置
     storage_service: Annotated[