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"

etc/smartdns/smartdns.conf.head

@@ -4,7 +4,7 @@
 server-name keenetic-split-dns
 log-level info
 cache-size 512
-cache-persist yes
+# cache-persist set by compile-config.sh
 prefetch-domain yes
 serve-expired yes
 dnsmasq-lease-file /var/lib/misc/dnsmasq.leases