https-dns-proxy: update to 2025-12-29-1

* bump binary to 2025.12.29 with support for -S
* update README and delete README in files/
* bugfix: properly load global option for `force_ipv6_resolvers`
* add global and per-instance `source_addr` option

Thanks to @karl82 for adding source_addr support upstream.

Signed-off-by: Stan Grishin <stangri@melmac.ca>
(cherry picked from commit c7eb47657e)
Signed-off-by: Stan Grishin <stangri@melmac.ca>

net/https-dns-proxy/README.md

@@ -1,4 +1,22 @@
-# README
+# https-dns-proxy
 
-Documentation for this project is available at [https://docs.openwrt.melmac.net/https-dns-proxy/](https://docs.openwrt.melmac.net/https-dns-proxy/).
+[![OpenWrt](https://img.shields.io/badge/OpenWrt-Compatible-blueviolet)](https://openwrt.org)
+[![Web UI](https://img.shields.io/badge/Web_UI-Available-blue)](https://docs.openwrt.melmac.ca/https-dns-proxy/)
+[![Resolvers](https://img.shields.io/badge/Resolvers-40%2B%20Built--in-brightgreen)](https://docs.openwrt.melmac.ca/https-dns-proxy/)
+[![Minimal Footprint](https://img.shields.io/badge/Size-~40KB-green)](https://github.com/stangri/https-dns-proxy)
+[![License](https://img.shields.io/badge/License-MIT-lightgrey)](https://github.com/stangri/https-dns-proxy/blob/master/LICENSE)
 
+A lightweight, RFC8484-compliant DNS-over-HTTPS (DoH) proxy service for OpenWrt.  
+Includes optional integration with `dnsmasq`, automatic fallback, and canary domain support.
+
+## Features
+
+- Small footprint (~40KB installed)
+- Seamless dnsmasq integration and fallback
+- Optional LuCI Web UI with 40+ built-in resolvers
+
+**Full documentation:**
+
+[https://docs.openwrt.melmac.ca/https-dns-proxy/](https://docs.openwrt.melmac.ca/https-dns-proxy/)
+
+Based on [@aarond10](https://github.com/aarond10)'s excellent [https_dns_proxy](https://github.com/aarond10/https_dns_proxy)