feat: implement robust FaceNet weights download from Hugging Face to bypass unreliable DeepFace upstream sources

implement thread-safe FaceNet model initialization and pre-bake weights into Docker image

Fix HF deployment timeout by setting HF_HUB_OFFLINE=1

feat: add Hugging Face Spaces metadata to README and simplify Dockerfile dependency from `libgl1-mesa-glx` to `libgl1`.

Implemented the first version of the application, handled the UI, face recognition, and database handling