feat(enclave): run face matching in matches flow

[Takaros999]

This PR:

• Introduces face-engine our internal engine for running face models, the same one that is used in our mobile apps.
• Adds a script to download models locally for development from Hugging Face.
• Adds the embedding comparison logic to the /matches route
• Adds an e2e test that I run inside a real nitro enclave and verified face engine works and runs

⚠️ This is still a prototype; You have to download models using the script and the face engine configs are placeholder defaults ⚠️

[socket-security]

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[chatgpt-codex-connector]

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