chore: simplify examples and print UI URL in runPrompt

- Remove logInspectorUrl calls from all examples
- Remove isMainModule checks from e2b, docker, vercel examples
- Simplify e2b, docker, vercel to match daytona's direct execution style
- Print UI URL at start of runPrompt in shared module

examples/shared/src/sandbox-agent-client.ts

@@ -118,6 +118,8 @@ function detectAgent(): string {
 }
 
 export async function runPrompt(baseUrl: string): Promise<void> {
+  console.log(`UI: ${buildInspectorUrl({ baseUrl })}`);
+
   const client = await SandboxAgent.connect({ baseUrl });
 
   const agent = detectAgent();