feat: add MCP server templates and deployment infrastructure

Introduce a Helm-chart-like template system for MCP servers. Templates are
YAML files in templates/ that get seeded into the DB on startup. Users can
browse them with `mcpctl get templates`, inspect with `mcpctl describe
template`, and instantiate with `mcpctl create server --from-template=`.

Also adds Portainer deployment scripts, mcplocal systemd service,
Streamable HTTP MCP endpoint, and RPM packaging for mcpctl-local.

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

deploy/mcplocal.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=mcpctl local MCP proxy
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/mcpctl-local
+Restart=on-failure
+RestartSec=5
+Environment=MCPLOCAL_MCPD_URL=http://10.0.0.194:3100
+Environment=MCPLOCAL_HTTP_PORT=3200
+Environment=MCPLOCAL_HTTP_HOST=127.0.0.1
+
+[Install]
+WantedBy=default.target