Add CC BY-NC 4.0 LICENSE file with attribution scope

LICENSE

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+This work is licensed under the
+Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
+
+To view a copy of this license, visit
+https://creativecommons.org/licenses/by-nc/4.0/legalcode
+or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+Summary of terms:
+- You are free to share and adapt this work for non-commercial purposes,
+  provided you give appropriate credit.
+- Commercial use is NOT permitted.
+- No additional restrictions may be imposed beyond what this license requires.
+
+------------------------------------------------------------------------------
+Scope
+------------------------------------------------------------------------------
+
+This license applies to the model weights distributed in this repository
+(model.safetensors and config.yaml). The released weights are derivative
+works of:
+
+  (a) The Depth Anything 3 "da3-giant" backbone
+      (https://github.com/ByteDance-Seed/Depth-Anything-3), released by
+      ByteDance Ltd. under CC BY-NC 4.0.
+
+  (b) Training on the PanoInfinigen dataset
+      (https://huggingface.co/datasets/prs-eth/PanoInfinigen). The "urban"
+      split of that dataset was rendered from scenes generated with the
+      iCity Blender addon by Hothifa Smair
+      (https://superhivemarket.com/products/icity), and is used here under
+      written authorization for non-commercial academic research from the
+      iCity author.
+
+PaGeR is the work of Vukasin Bozic et al. at the Photogrammetry and Remote
+Sensing Lab (PRS), ETH Zürich, 2026.