Fix Docker build for modern Debian base images and Windows line endings

[hopzinga22]

Summary

The api and worker services failed to build on current Docker/Debian images due to a renamed package, and shell scripts in bin/ failed to run on containers checked out from a Windows machine due to CRLF line endings. This PR fixes both issues so the project builds and runs cleanly on current systems.

Problem

1. Build failure: libgl1-mesa-glx was removed/renamed in current Debian (trixie), causing:
2. Runtime failure (Windows checkouts): bin/web_entrypoint.sh and bin/worker_production_entrypoint.sh were checked out with CRLF line endings on Windows (via Git's core.autocrlf behavior), causing the shebang line to be misread as bash\r: making both api and worker containers to exit immediately with code 127.
3. Minor: obsolete version: attribute in docker-compose.yaml, and deprecated MAINTAINER instruction in the Dockerfile, both flagged by Docker Compose/Buildx warnings.

Changes

• Replaced libgl1-mesa-glx with libgl1 in the Dockerfile
• Replaced MAINTAINER with LABEL maintainer=...
• Removed obsolete version: attribute from docker-compose.yaml
• Added .gitattributes to enforce LF line endings on .sh files, preventing this issue for future Windows contributors
• Converted existing bin/*.sh scripts to LF line endings
• Updated README to note that requestbin.com may be unreliable, suggesting webhook.site as a working alternative for testing callback_url

Testing

Verified locally on Windows 11 (Docker Desktop, WSL2 backend):

• docker-compose build api worker completes successfully
• docker-compose up brings up all six services (api, worker, database, broker, redis, minio) with api correctly exposed on the configured port
• Sent a test image via curl to /api/image/, received 202 Accepted, and confirmed the async callback fired successfully with face detection results