[hdrezka] add external config

[DesSolo]

Centralized Configuration Management

Motivation: This update allows users with multiple Kodi devices to manage settings from a single external configuration file. Instead of manually updating each device individually.

⚠️ Critical Notes: Sensitive values like domain, username, password, and proxy_url MUST NOT be exposed in public repositories or unsecured channels.

Available values:

key	config name	supported values	example
use_transliteration	Use transliteration	one of true/false	false
quality	Video quality	one of select/360p/480p/720p/1080p/1080p Ultra/1440p/2160p	select
translator	Use translator	one of default/select	default
dom_protocol	Protocol	one of http/https	https
domain	Site URL	string	REDACTED
show_description	Get media description	one of true/false	true
username	Username	string	-
password	Password	string	-
use_proxy	Use proxy settings	one of true/false	false
protocol	Protocol	one of http/https/socks5	http
proxy_url	URL	string	USERNAME:PASSWORD@IPADDRESS:PORT
external_config_url	URL	string	https://example.com/path_for_file.json

Example http response:

{
  "quality": "720p",
  "translator": "select",
  "dom_protocol": "http",
  "domain": "REDACTED",
  "show_description": "true"
}