first commit

api/app/core/viewshed.py

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+from dataclasses import dataclass
+from typing import Any
+
+
+@dataclass(frozen=True)
+class RasterResult:
+    uri: str
+    metadata: dict[str, Any]
+
+
+def compute_viewshed(
+    observer: object,
+    radius_m: float,
+    target_h: float,
+    surface: str,
+    k: float,
+) -> RasterResult:
+    raise NotImplementedError(
+        "Viewshed requires WhiteboxTools or gdal_viewshed integration in a later stage"
+    )