Fix Docker image build - complete multi-stage Dockerfile

[nitrobass24]

Summary

This PR fixes the broken Docker image by implementing a complete multi-stage build that properly includes all required components:

• Angular frontend - Was missing entirely from previous Docker builds
• scanfs binary - File system scanner now properly built and included
• Python 3.11 support - Updated from Python 3.8 (EOL October 2024)
• PUID/PGID permissions - Improved entrypoint script for proper user/group handling

Changes

Dockerfile (complete rewrite)

• Stage 1: Build Angular frontend with Node 12
• Stage 2: Build scanfs binary with PyInstaller
• Stage 3: Python 3.11 runtime with all components assembled

Python (pyproject.toml)

• Updated Python version constraint from ~3.8 to ^3.8 (allows 3.8-3.12)
• Updated dev-dependencies format for newer Poetry

Angular

• package.json: Updated node-sass version for build compatibility
• tsconfig.json: Added skipLibCheck to resolve type definition conflicts

Entrypoint Script

• Enhanced PUID/PGID handling for mounted volumes
• Better error handling and user creation

Documentation

• Added CHANGELOG.md documenting this release
• Added MODERNIZATION_PLAN.md with codebase architecture and future roadmap
• Added docker-compose.dev.yml for easy local development/testing

Testing

• Built and tested on Docker Desktop (macOS ARM64)
• Web UI accessible and functional at http://localhost:8800
• Container starts correctly with PUID/PGID environment variables

Related Issues

This PR addresses several open issues:

• PermissionError: [Errno 13] Permission denied: '/config/settings.cfg' #137 - PermissionError with PUID/PGID
• 'tmp/scanfs: error while loading shared libraries: libz.so.1: failed to map segment from shared object'. #136, Error while loading shared libraries: libz.so.1: failed to map segment from shared object #97 - Partial fix (scanfs binary now included, though remote server /tmp issues may persist)
• project still alive ? #140 - Project revival effort

Test Plan

• Build Docker image: docker compose -f docker-compose.dev.yml build
• Start container: docker compose -f docker-compose.dev.yml up
• Verify web UI loads at http://localhost:8800
• Configure remote server and test file sync

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