Clash Controller 0.3.1

Based on upstream Clash Controller v0.3.0, preserving its features and compatibility.

Fixes HTTP 400 when selecting a Mihomo proxy node whose configured name starts or ends with whitespace. Proxy group and node names are sent exactly as configured.

For this Home Assistant instance, the local dashboard reads the installed version from the HACS update entity and is updated separately in /config/www/clash-dashboard.js.