feat: Add comprehensive documentation suite and reorganize project structure

- Created complete documentation in docs/ directory
- Added PROJECT_OVERVIEW.md with feature highlights and getting started guide
- Added ARCHITECTURE.md with system design and technical details
- Added SECURITY.md with comprehensive security implementation guide
- Added DEVELOPMENT.md with development workflows and best practices
- Added DEPLOYMENT.md with production deployment instructions
- Added API.md with complete REST API documentation
- Added CONTRIBUTING.md with contribution guidelines
- Added CHANGELOG.md with version history and migration notes
- Reorganized all documentation files into docs/ directory for better organization
- Updated README.md with proper documentation links and quick navigation
- Enhanced project structure with professional documentation standards

Dockerfile.cron

@@ -0,0 +1,13 @@
+FROM php:8.2-cli
+
+RUN apt-get update && apt-get install -y cron && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /srv/easystream
+
+COPY deploy/cron/crontab /etc/cron.d/easystream
+COPY deploy/cron/init.sh /usr/local/bin/init-cron
+
+RUN chmod 0644 /etc/cron.d/easystream \
+    && chmod +x /usr/local/bin/init-cron
+
+CMD ["/usr/local/bin/init-cron"]