Preserve native orthophoto detail for training

backend/app/schemas/orthophoto.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from uuid import UUID
 
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 
 from .operations import VectorSelectionBBox
 
@@ -12,6 +12,7 @@ class OrthophotoAcquireRequest(BaseModel):
     area_id: UUID | None = None
     product_key: str = "most_recent"
     force_refresh: bool = False
+    resolution_m: float | None = Field(default=None, ge=0.1, le=2.0)
 
 
 class OrthophotoProductRead(BaseModel):