feat(setup): wire setup command into CLI and start command

- Register setup command in CLI index
- Offer setup wizard when running `flynn start` with no config
- Guard telegram log output since telegram is now optional

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

src/cli/index.ts

@@ -7,6 +7,7 @@ import { registerDoctorCommand } from './doctor.js';
 import { registerConfigCommand } from './config-cmd.js';
 import { registerTuiCommand } from './tui.js';
 import { registerCompletionCommand } from './completion.js';
+import { registerSetupCommand } from './setup.js';
 
 export function createProgram(): Command {
   const program = new Command();
@@ -23,6 +24,7 @@ export function createProgram(): Command {
   registerDoctorCommand(program);
   registerConfigCommand(program);
   registerCompletionCommand(program);
+  registerSetupCommand(program);
 
   return program;
 }