Remove obsolete files and clean up repository structure

Removed unused files:
- oidc-middleware.js (unused OIDC authentication code)
- package.json (dependencies for unused middleware)
- healthcheck.js (Cloudron uses manifest healthCheckPath instead)

Updated Dockerfile to remove healthcheck.js references.
Updated DEPLOYMENT.md to reflect current repository structure.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Dockerfile

@@ -24,7 +24,6 @@ RUN mkdir -p /tmp/data /app/data && \
 
 # Copy startup scripts and configuration files
 COPY start.sh /app/code/
-COPY healthcheck.js /app/code/
 COPY nginx.conf /etc/nginx/sites-available/default
 COPY env.sample /app/code/env.sample
 COPY CONFIGURATION.md /app/code/CONFIGURATION.md
@@ -34,7 +33,7 @@ RUN sed -i 's|error_log /var/log/nginx/error.log;|error_log /dev/stderr;|' /etc/
     sed -i 's|access_log /var/log/nginx/access.log;|access_log /dev/stdout;|' /etc/nginx/nginx.conf
 
 # Make scripts executable
-RUN chmod +x /app/code/start.sh /app/code/healthcheck.js
+RUN chmod +x /app/code/start.sh
 
 # Install supervisord and netcat for process management and connectivity checks
 RUN apt-get update && \