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>

nfpm.yaml

@@ -10,6 +10,14 @@ contents:
     dst: /usr/bin/mcpctl
     file_info:
       mode: 0755
+  - src: ./dist/mcpctl-local
+    dst: /usr/bin/mcpctl-local
+    file_info:
+      mode: 0755
+  - src: ./deploy/mcplocal.service
+    dst: /usr/lib/systemd/user/mcplocal.service
+    file_info:
+      mode: 0644
   - src: ./completions/mcpctl.bash
     dst: /usr/share/bash-completion/completions/mcpctl
     file_info: