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/router/lio.py

@@ -16,6 +16,7 @@ from app.dependencies.storage import StorageService
 from app.log import log
 from app.models.playlist import PlaylistItem
 from app.models.room import MatchType, QueueMode, RoomCategory, RoomStatus
+from app.models.score import RULESETS_VERSION_HASH, GameMode, VersionEntry
 from app.utils import camel_to_snake, utcnow
 
 from .notification.server import server
@@ -150,7 +151,7 @@ def _validate_playlist_items(items: list[dict[str, Any]]) -> None:
             )
 
         ruleset_id = item["ruleset_id"]
-        if not isinstance(ruleset_id, int) or not (0 <= ruleset_id <= 3):
+        if not isinstance(ruleset_id, int):
             raise HTTPException(
                 status_code=status.HTTP_400_BAD_REQUEST,
                 detail=f"Playlist item at index {idx} has invalid ruleset_id {ruleset_id}",
@@ -679,3 +680,8 @@ async def save_replay(
     replay_data = req.mreplay
     replay_path = f"replays/{req.score_id}_{req.beatmap_id}_{req.user_id}_lazer_replay.osr"
     await storage_service.write_file(replay_path, base64.b64decode(replay_data), "application/x-osu-replay")
+
+
+@router.get("/ruleset-hashes", response_model=dict[GameMode, VersionEntry])
+async def get_ruleset_version():
+    return RULESETS_VERSION_HASH