Major refactor: Fix SQLite concurrency, remove rate limiting, simplify architecture

- Switch to single Gunicorn worker to eliminate SQLite database locking issues
- Remove Flask-Limiter and all rate limiting complexity
- Remove Cloudflare proxy setup and dependencies
- Simplify configuration and remove unnecessary features
- Update all templates and static files for streamlined operation
- Clean up old files and documentation
- Restore stable database from backup
- System now runs fast and reliably without database locks

nginx-ircquotes.conf

@@ -6,7 +6,8 @@ server {
     server_name your-domain.com;  # Replace with your actual domain
     
     # Cloudflare real IP restoration
-    # Get latest Cloudflare IP ranges from: https://www.cloudflare.com/ips/
+    # Updated Cloudflare IP ranges (as of September 2025)
+    # IPv4 ranges
     set_real_ip_from 173.245.48.0/20;
     set_real_ip_from 103.21.244.0/22;
     set_real_ip_from 103.22.200.0/22;
@@ -23,7 +24,7 @@ server {
     set_real_ip_from 172.64.0.0/13;
     set_real_ip_from 131.0.72.0/22;
     
-    # IPv6 ranges (optional)
+    # IPv6 ranges
     set_real_ip_from 2400:cb00::/32;
     set_real_ip_from 2606:4700::/32;
     set_real_ip_from 2803:f800::/32;