fix: remove 16 non-existent apps from showcase, correct count 93→76

Removed apps that have no deploy template in code:
- Subsonic, Vikunja, OpenProject, Plane, HedgeDoc
- Yacht, Authelia, Keycloak, OpenVPN, Bitwarden
- Forgejo, GitLab, Prometheus, Netdata, Kibana, OpenHAB

Also fixed name: 'Vintage Radio' → 'Vintage Stereo' (matches actual template)
Corrected all '93+' references to '76' across all pages.
Deployed to live dashcaddy.net via cPanel API.

src/app/docs/premium/page.tsx

@@ -39,7 +39,7 @@ export default function DocsPremiumPage() {
           </thead>
           <tbody>
             <tr><td>Dashboard &amp; web UI</td><td>✓</td><td>✓</td></tr>
-            <tr><td>93+ application templates</td><td>✓</td><td>✓</td></tr>
+            <tr><td>76 application templates</td><td>✓</td><td>✓</td></tr>
             <tr><td>Caddy reverse proxy + auto HTTPS</td><td>✓</td><td>✓</td></tr>
             <tr><td>Caddyfile-as-Code builder</td><td>✓</td><td>✓</td></tr>
             <tr><td>Technitium DNS automation</td><td>✓</td><td>✓</td></tr>