Add server selector to basic-host example (#95)

* Add server selector to basic-host example

- Add ServerSelector component to switch between MCP servers
- Run all example servers concurrently on ports 3101-3107
- Update examples:start to launch all servers with assigned ports

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

* Move server selector into tool call panel

- Server selector now in same component as tool selector
- Tool call results persist across server switches
- Connection caching avoids reconnects when switching servers
- Display server name with tool name in results (ServerName:ToolName)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

---------

Co-authored-by: Claude <noreply@anthropic.com>

examples/basic-host/src/index.module.css

@@ -1,3 +1,9 @@
+.connecting {
+  padding: 1rem 0;
+  text-align: center;
+  color: #666;
+}
+
 .callToolPanel, .toolCallInfoPanel {
   margin: 0 auto;
   padding: 1rem;
@@ -10,6 +16,9 @@
 }
 
 .callToolPanel {
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
   max-width: 480px;
 
   form {