fix: keep stdin open for STDIO servers + describe instance resolves server names

STDIO MCP servers read from stdin and exit on EOF. Docker containers close
stdin by default, causing all STDIO servers to crash immediately. Added
OpenStdin: true to container creation.

Describe instance now resolves server names (like logs command), preferring
RUNNING instances. Added 7 new describe tests covering server name resolution,
healthcheck display, events section, and template detail.

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

src/mcpd/src/services/docker/container-manager.ts

@@ -80,6 +80,9 @@ export class DockerContainerManager implements McpOrchestrator {
       Env: envArr,
       ExposedPorts: exposedPorts,
       Labels: labels,
+      // Keep stdin open for STDIO MCP servers (they read from stdin)
+      OpenStdin: true,
+      StdinOnce: false,
       HostConfig: {
         PortBindings: portBindings,
         Memory: memoryLimit,