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>

src/db/tests/helpers.ts

@@ -53,5 +53,6 @@ export async function clearAllTables(client: PrismaClient): Promise<void> {
   await client.session.deleteMany();
   await client.project.deleteMany();
   await client.mcpServer.deleteMany();
+  await client.mcpTemplate.deleteMany();
   await client.user.deleteMany();
 }