feat(T07): KI-Copilot with OpenRouter chat, voice input, action system, chat history

backend/app/schemas/copilot.py

@@ -0,0 +1,94 @@
+"""Pydantic schemas for Copilot chat, action, voice, and history endpoints."""
+
+from datetime import datetime
+from typing import Any, Optional
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class ChatRequest(BaseModel):
+    """Request body for POST /copilot/chat."""
+
+    message: str = Field(..., min_length=1, description="User message to the Copilot")
+    session_id: Optional[str] = Field(None, description="Existing session UUID to continue")
+
+
+class ActionItem(BaseModel):
+    """A single action proposed by the Copilot."""
+
+    type: str = Field(..., description="Action type, e.g. search_vehicles")
+    params: dict[str, Any] = Field(default_factory=dict, description="Action parameters")
+
+
+class ChatResponse(BaseModel):
+    """Response body for POST /copilot/chat."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    response: str = Field(..., description="Assistant text response")
+    actions: list[ActionItem] = Field(default_factory=list, description="Proposed actions")
+    session_id: str = Field(..., description="Session UUID")
+    message_id: str = Field(..., description="Assistant message UUID")
+
+
+class ActionRequest(BaseModel):
+    """Request body for POST /copilot/action — user confirms an action."""
+
+    action: str = Field(..., min_length=1, description="Action type to execute")
+    params: dict[str, Any] = Field(default_factory=dict, description="Action parameters")
+    session_id: Optional[str] = Field(None, description="Session context")
+
+
+class ActionResponse(BaseModel):
+    """Response body for POST /copilot/action."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    action: str = Field(..., description="Executed action type")
+    result: Any = Field(..., description="Action result data")
+    success: bool = Field(..., description="Whether the action succeeded")
+
+
+class ChatMessageItem(BaseModel):
+    """A single chat message in history."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    id: str
+    session_id: str
+    role: str
+    content: str
+    actions: Optional[list[dict[str, Any]]] = None
+    created_at: Optional[datetime] = None
+
+
+class ChatHistoryResponse(BaseModel):
+    """Paginated chat history response."""
+
+    items: list[ChatMessageItem] = Field(default_factory=list)
+    total: int = Field(0)
+    page: int = Field(1)
+    page_size: int = Field(20)
+
+
+class VoiceRequest(BaseModel):
+    """Request body for POST /copilot/voice.
+
+    Accepts base64-encoded audio data for transcription.
+    """
+
+    audio: str = Field(..., min_length=1, description="Base64-encoded audio data")
+    mime_type: str = Field("audio/webm", description="Audio MIME type")
+    session_id: Optional[str] = Field(None, description="Existing session UUID")
+
+
+class VoiceResponse(BaseModel):
+    """Response body for POST /copilot/voice."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    transcription: str = Field(..., description="Transcribed text")
+    response: str = Field(..., description="Assistant text response")
+    actions: list[ActionItem] = Field(default_factory=list, description="Proposed actions")
+    session_id: str = Field(..., description="Session UUID")
+    message_id: str = Field(..., description="Assistant message UUID")