Initial release: install, uninstall, SmartDNS, web UI

Co-authored-by: Cursor <cursoragent@cursor.com>

etc/lighttpd/lighttpd.conf

@@ -0,0 +1,29 @@
+# Keenetic-Split-DNS web UI — lighttpd
+# Installed to /opt/etc/keenetic-split-dns/lighttpd.conf
+
+server.document-root = "/opt/share/keenetic-split-dns/www"
+server.port = 3200
+server.bind = "LAN_IP_PLACEHOLDER"
+server.errorlog = "/opt/var/log/keenetic-split-dns/lighttpd-error.log"
+server.pid-file = "/opt/var/run/keenetic-split-dns/lighttpd.pid"
+
+index-file.names = ( "index.html" )
+mimetype.assign = (
+  ".html" => "text/html",
+  ".css"  => "text/css",
+  ".js"   => "application/javascript",
+  ".json" => "application/json",
+  ".svg"  => "image/svg+xml",
+  ".ico"  => "image/x-icon"
+)
+
+cgi.assign = (
+  ".cgi" => ""
+)
+
+url.rewrite-once = (
+  "^/api/?$" => "/api.cgi/status",
+  "^/api/(.*)$" => "/api.cgi/$1"
+)
+
+# LAN only — bind set at install/apply from config.yaml