fix: pollora:install completes without a terminal

[ogorzalka]

Problem

Found while checking #297–#301 on a fresh v13.34.0 install: pollora new --ddev --no-interaction (CLI v1.2.2) ends with

Starting WordPress installation...
Site title is required
php artisan pollora:install failed.

The CLI runs pollora:install with no option and no terminal. Symfony then marks the input non-interactive, Laravel Prompts falls back to each prompt's default (empty), and the required rule aborts. With CLI v1.1.1 the same failure was silent — the CLI announced success on a site without WordPress installed.

Change

• InstallationConfig::withDefaults(): keeps every option given, fills the rest — title from the project directory (acme-site → Acme Site), admin, admin@<APP_URL host> (else example.com), a generated 20-character password, en_US, not indexed.
• pollora:install uses it whenever it cannot prompt; interactive runs are unchanged (fromPrompts()).
• A generated password is printed once — also in --install mode, where it would otherwise be lost. A password passed as an option is never printed.

Tests

Three new cases in LaunchPadInstallCommandTest (defaults, password shown once, options kept and not echoed); the first two fail on the old code. Full suite 1371 green, PHPStan 0, Rector clean.

The CLI side (forwarding --no-interaction) is a separate PR on Pollora/cli.