docs: fix tsc command to use tsconfig.json (#188)

Remove 'server.ts' argument from 'npx tsc --noEmit' command.

When a file is specified directly, TypeScript ignores tsconfig.json,
causing skipLibCheck and other options to not apply. This results in
errors from node_modules (especially zod v4 locale files).

The correct command lets tsc use the project's tsconfig.json settings.

docs/quickstart.md

@@ -180,7 +180,7 @@ app.listen(3001, (err) => {
 Then, verify your server compiles:
 
 ```bash
-npx tsc --noEmit server.ts
+npx tsc --noEmit
 ```
 
 No output means success. If you see errors, check for typos in `server.ts`.