fix: audit corrections

Fix YAML section parsing and upstream ID extraction in compile-config,
detect-lan shell syntax, lighttpd CGI modules, API reload path, install
idempotency, and dashboard log display.

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

etc/lighttpd/lighttpd.conf

@@ -1,6 +1,11 @@
 # Keenetic-Split-DNS web UI — lighttpd
 # Installed to /opt/etc/keenetic-split-dns/lighttpd.conf
 
+server.modules += (
+  "mod_cgi",
+  "mod_rewrite"
+)
+
 server.document-root = "/opt/share/keenetic-split-dns/www"
 server.port = 3200
 server.bind = "LAN_IP_PLACEHOLDER"