v1.0.14 of flutter_pitel_voip

flutter_pitel_voip is package support for voice-over-IP (VoIP) call. Support VoIP call between 2 extension or outgoing call mobile phone number. Changelog excerpt: - Feature: Support configurable `userAgent`in `SipInfoData`for SIP registration and call signaling. - Enhancement: Automatically sanitize `userAgent`(strip special characters/accents, prevent CRLF injection, and truncate to maximum 30 characters) with fallback to `'Flutter VoIP SDK'`. - Update: Document `userAgent`configuration and examples in `README.md`.