Prepare 3.2.0

[julien-nc]

Added

• Add integration tests covering real notification parsing plus topic and post search behavior @julien-nc #98

Changed

• Move app config to lazy and sensitive values, refresh the settings form, update frontend and composer dependencies, and avoid double-encrypting the private key @julien-nc #88
• Update maintenance tooling with vendor-bin Psalm, npm package refreshes, Nextcloud 34 support, and PHP platform 8.2 targeting @julien-nc #97
• Add OAuth integration coverage, upgrade to PHPUnit 11 and phpseclib 3, improve RSA decryption safety, and clear used nonces instead of blanking them @julien-nc #101