Feat/group photo processor worker

[maya-ots]

summary

implements a JetStream worker that processes group photos , detects all faces, matches them against enrolled users, and creates PhotoFace and PhotoApproval records for each match.

technical implementation

• added PHOTO_GROUP_PROCESS subject to NatsSubjects.
• created db/generated/photo_faces.py querier for creating PhotoFace records.
• created db/generated/photo_approvals.py querier for creating PhotoApproval records.
• added list_users_with_embedding() query to db/generated/user.py.
• created app/worker/photo_processor/schema/event.py Pydantic model for the JetStream event payload.
• created app/worker/photo_processor/main.py worker that:
  • fetches photo from MinIO.
  • detects all faces in the photo and computes embeddings.
  • compares each embedding against all enrolled users using cosine similarity.
  • creates a PhotoFace record per detected face.
  • creates a PhotoApproval record with decision=pending for each matched user.

testing

• Added unit tests for PhotoGroupProcessWorker :
  • handles no faces detected (exits early).
  • creates PhotoFace and PhotoApproval for matched users.
  • does not create PhotoApproval for unmatched users.