feat(api): add classify endpoint for single image URL detection

feat(api): enhance image detection with thread-safe detector instance

feat(parse): allow single-url payloads at root level

feat(api): add flexible image URL parsing for detection endpoint

fix(docker): add missing libegl1 and libgles2 dependencies to Dockerfile

refactor(docker): add libxcb1 dependency

fix(docker): add missing libxcb1 dependency to Dockerfile

chore(docker): remove libgl1-mesa-glx from image

feat(api): add fastapi app with face landmarker detection

initial commit