fix: Resolve Docker volume permissions for SQLite database

Fixed SQLITE_READONLY errors by implementing proper volume permission
handling in Docker container. The issue occurred because Docker volumes
are mounted with root ownership, preventing the non-root nuxt user from
writing to the database.

Solution:
- Added docker-entrypoint.sh script to handle permission fixes
- Container starts as root to fix /app/data permissions
- Uses su-exec to drop privileges to nuxt user after fixing permissions
- Maintains security by running application as non-root user

This allows the SQLite database to be properly created and modified
while keeping the container secure with non-root execution.

Fixes:
- "attempt to write a readonly database" errors
- Session cleanup failures
- Rate limit cleanup failures
- Password reset cleanup failures
- Admin credential generation on first launch

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

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

Dockerfile

@@ -54,8 +54,8 @@ FROM node:20-alpine AS runtime
 
 WORKDIR /app
 
-# Install dumb-init for proper signal handling
-RUN apk add --no-cache dumb-init
+# Install dumb-init and su-exec for proper signal handling and user switching
+RUN apk add --no-cache dumb-init su-exec
 
 # Create non-root user for security
 RUN addgroup -g 1001 -S nodejs && \
@@ -66,11 +66,15 @@ COPY --from=builder --chown=nuxt:nodejs /app/.output ./.output
 COPY --from=builder --chown=nuxt:nodejs /app/node_modules ./node_modules
 COPY --from=builder --chown=nuxt:nodejs /app/package.json ./package.json
 
+# Copy entrypoint script
+COPY docker-entrypoint.sh /usr/local/bin/
+RUN chmod +x /usr/local/bin/docker-entrypoint.sh
+
 # Create data directory for SQLite database with proper permissions
 RUN mkdir -p /app/data && chown -R nuxt:nodejs /app/data
 
-# Switch to non-root user
-USER nuxt
+# Don't switch to non-root user yet - entrypoint will handle it
+# This allows the entrypoint to fix volume permissions first
 
 # Expose port
 EXPOSE 3000
@@ -88,6 +92,6 @@ ENV NUXT_PORT=3000
 HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
   CMD node -e "require('http').get('http://localhost:3000/api/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})" || exit 1
 
-# Use dumb-init to properly handle signals
-ENTRYPOINT ["dumb-init", "--"]
+# Use custom entrypoint to handle permissions and user switching
+ENTRYPOINT ["dumb-init", "--", "docker-entrypoint.sh"]
 CMD ["node", ".output/server/index.mjs"]