refactor(signalr): remove SignalR server & msgpack_lazer_api

Maybe we can make `msgpack_lazer_api` independent?

app/models/signalr.py

@@ -1,37 +1 @@
-from __future__ import annotations
 
-from dataclasses import dataclass
-from typing import ClassVar
-
-from pydantic import (
-    BaseModel,
-    Field,
-)
-
-
-@dataclass
-class SignalRMeta:
-    member_ignore: bool = False  # implement of IgnoreMember (msgpack) attribute
-    json_ignore: bool = False  # implement of JsonIgnore (json) attribute
-    use_abbr: bool = True
-
-
-class SignalRUnionMessage(BaseModel):
-    union_type: ClassVar[int]
-
-
-class Transport(BaseModel):
-    transport: str
-    transfer_formats: list[str] = Field(default_factory=lambda: ["Binary", "Text"], alias="transferFormats")
-
-
-class NegotiateResponse(BaseModel):
-    connectionId: str
-    connectionToken: str
-    negotiateVersion: int = 1
-    availableTransports: list[Transport]
-
-
-class UserState(BaseModel):
-    connection_id: str
-    connection_token: str