Revert "Early 0.18 work (#22138)" (#22142)

This reverts commit d24b96d3bb.

frigate/api/defs/request/chat_body.py

@@ -1,41 +0,0 @@
-"""Chat API request models."""
-
-from typing import Optional
-
-from pydantic import BaseModel, Field
-
-
-class ChatMessage(BaseModel):
-    """A single message in a chat conversation."""
-
-    role: str = Field(
-        description="Message role: 'user', 'assistant', 'system', or 'tool'"
-    )
-    content: str = Field(description="Message content")
-    tool_call_id: Optional[str] = Field(
-        default=None, description="For tool messages, the ID of the tool call"
-    )
-    name: Optional[str] = Field(
-        default=None, description="For tool messages, the tool name"
-    )
-
-
-class ChatCompletionRequest(BaseModel):
-    """Request for chat completion with tool calling."""
-
-    messages: list[ChatMessage] = Field(
-        description="List of messages in the conversation"
-    )
-    max_tool_iterations: int = Field(
-        default=5,
-        ge=1,
-        le=10,
-        description="Maximum number of tool call iterations (default: 5)",
-    )
-    include_live_image: Optional[str] = Field(
-        default=None,
-        description=(
-            "If set, the current live frame from this camera is attached to the first "
-            "user message as multimodal content. Use with get_live_context for detection info."
-        ),
-    )