feat: modpack version checker dashboard + PHP proxy (v1.0)

WHAT WAS DONE:
- Built browser dashboard (dashboard.html) showing installed vs latest version
  for all Pterodactyl game servers
- Built PHP proxy (proxy.php + config.php) for Billing VPS deployment
- Created isolated Nginx server block (version-proxy.conf)
- Created full deployment guide (DEPLOYMENT-GUIDE.md)

ARCHITECTURE:
- PHP proxy at /var/www/version-proxy on Billing VPS (38.68.14.188)
- Isolated from Paymenter/Laravel routing — separate directory + port
- API keys (Pterodactyl ptlc_, CurseForge) live server-side only
- FTB packs: fully automatic via .manifest.json + FTB public API
- CurseForge packs: reads manifest.json, needs CF Project ID + API key
- config.php blocked from direct web access via Nginx

PENDING AT DEPLOYMENT:
- Verify port 8080 is free (ss -tlnp) before enabling Nginx block
- Fill real API keys into config.php on server
- Enter CurseForge Project IDs for CF packs (saved in localStorage)

COLLABORATION:
- PHP proxy architecture designed by Gemini (consultation session 2026-03-29)
- Dashboard HTML and detection logic by Chronicler #47
- Gemini identified Laravel routing conflict and content-type gotcha

WHY:
- Interim solution before full Blueprint extension (post-launch)
- Hands-off modpack update monitoring for staff
- Zero manual checking required after initial CF Project ID setup

Signed-off-by: claude@firefrostgaming.com

docs/tasks/modpack-version-checker/proxy/version-proxy.conf

@@ -0,0 +1,38 @@
+# /etc/nginx/sites-available/version-proxy.conf
+# Isolated Nginx block for the modpack version checker PHP proxy
+# Hosted on Billing VPS (38.68.14.188) in its own directory
+# to avoid conflicts with Paymenter (Laravel) and Mailcow routing.
+#
+# BEFORE ENABLING: verify port 8080 is free with `ss -tlnp`
+# If 8080 is taken, change to 8081 or 8090 here AND in the HTML dashboard's PROXY_URL.
+
+server {
+    # Custom port — avoids Paymenter/Mailcow conflicts
+    # Verify with: ss -tlnp | grep 8080
+    listen 8080;
+
+    server_name _;
+
+    root /var/www/version-proxy;
+    index proxy.php;
+
+    location / {
+        try_files $uri $uri/ /proxy.php?$query_string;
+    }
+
+    location ~ \.php$ {
+        include snippets/fastcgi-php.conf;
+        # PHP 8.3 socket (matches existing Billing VPS environment)
+        fastcgi_pass unix:/var/run/php/php8.3-fpm.sock;
+    }
+
+    # Block access to config.php directly
+    location = /config.php {
+        deny all;
+        return 404;
+    }
+
+    location ~ /\.ht {
+        deny all;
+    }
+}