feat: add --https flag for auto-generated self-signed certificates

[hemanth]

What

Adds a --https flag that auto-generates a self-signed TLS certificate at startup, so you can serve over HTTPS without providing your own certs.

serve --https
# INFO  Auto-generated self-signed certificate for HTTPS.
# Serving!
# - Local:    https://localhost:3000
# - Network:  https://192.168.1.216:3000

Why

Testing service workers, WebAuthn, Secure Contexts, and other HTTPS-only browser APIs locally shouldn't require mkcert or OpenSSL. One flag, zero setup.

How

• New source/utilities/tls.ts — generates a self-signed X.509 v3 certificate using Node's built-in crypto module (no new dependencies)
• Certificate is valid for localhost, 127.0.0.1, and ::1 (1-year validity, 2048-bit RSA)
• Wired into the existing https.createServer() path in server.ts
• Explicit --ssl-cert/--ssl-key takes priority over --https
• Regular HTTP behavior unchanged

Files changed

File	Change
source/utilities/tls.ts	NEW — self-signed cert generator
source/types.ts	Added --https to Options
source/utilities/cli.ts	Help text + arg parser
source/utilities/server.ts	Auto-cert wiring

Testing

• serve --https → serves on https://localhost:3000
• curl -k https://localhost:3000 → HTTP 200
• serve (without flag) → HTTP unchanged

[hemanth]

//cc @rauchg @timneutkens @arunoda