docs: fix RPM install to use public URL with manual repo file

Gitea's auto-generated .repo file contains internal IPs. Use a manual
repo file with the public mysources.co.uk baseurl instead.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -30,7 +30,13 @@ Claude Code  <--STDIO-->  mcplocal (local proxy)  <--HTTP-->  mcpd (daemon)  <--
 
 ```bash
 # From RPM repository (Fedora/RHEL)
-sudo dnf config-manager --add-repo https://mysources.co.uk/api/packages/michal/rpm.repo
+sudo tee /etc/yum.repos.d/mcpctl.repo <<'EOF'
+[mcpctl]
+name=mcpctl
+baseurl=https://mysources.co.uk/api/packages/michal/rpm
+enabled=1
+gpgcheck=0
+EOF
 sudo dnf install mcpctl
 
 # Or build from source