feat(T08): Bildretusche via Flux.1-Pro + Preisvergleich + Retouch UI with before/after slider

backend/app/schemas/retouch.py

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+"""Pydantic schemas for image retouch and price comparison endpoints."""
+
+import uuid
+from datetime import datetime
+from typing import Optional
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class RetouchProcessResponse(BaseModel):
+    """Response for POST /api/v1/retouch/process."""
+
+    message: str = "Retouch processing queued"
+    retouch_id: uuid.UUID
+    status: str = "pending"
+
+
+class RetouchResultResponse(BaseModel):
+    """Response for GET /api/v1/retouch/results/:id."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    id: uuid.UUID
+    vehicle_id: Optional[uuid.UUID] = None
+    original_file_path: str
+    original_file_name: str
+    mime_type: str
+    retouched_file_path: Optional[str] = None
+    status: str
+    error_message: Optional[str] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+
+class PriceCompareRequest(BaseModel):
+    """Request body for POST /api/v1/retouch/price-compare."""
+
+    vehicle_id: uuid.UUID = Field(..., description="Vehicle ID to compare prices for")
+
+
+class ComparableListing(BaseModel):
+    """A single comparable listing from mobile.de or mock data."""
+
+    title: str
+    make: str
+    model: str
+    year: Optional[int] = None
+    price: float
+    mileage_km: Optional[int] = None
+    location: Optional[str] = None
+    url: Optional[str] = None
+    source: str = "mobile.de"
+
+
+class PriceCompareResponse(BaseModel):
+    """Response for POST /api/v1/retouch/price-compare."""
+
+    vehicle_id: uuid.UUID
+    comparable_listings: list[ComparableListing] = Field(default_factory=list)
+    average_price: Optional[float] = None
+    listing_count: int = 0