Reapply "Merge branch 'main' of https://github.com/GooGuTeam/osu_lazer_api"

This reverts commit 68701dbb1d.

app/models/signalr.py

@@ -0,0 +1,31 @@
+from __future__ import annotations
+
+from typing import Any
+
+from pydantic import BaseModel, Field, model_validator
+
+
+class MessagePackArrayModel(BaseModel):
+    @model_validator(mode="before")
+    @classmethod
+    def unpack(cls, v: Any) -> Any:
+        if isinstance(v, list):
+            fields = list(cls.model_fields.keys())
+            if len(v) != len(fields):
+                raise ValueError(f"Expected list of length {len(fields)}, got {len(v)}")
+            return dict(zip(fields, v))
+        return v
+
+
+class Transport(BaseModel):
+    transport: str
+    transfer_formats: list[str] = Field(
+        default_factory=lambda: ["Binary"], alias="transferFormats"
+    )
+
+
+class NegotiateResponse(BaseModel):
+    connectionId: str
+    connectionToken: str
+    negotiateVersion: int = 1
+    availableTransports: list[Transport]