Effective config, hosts/addn-hosts logic, test harness status & logs

- EffectiveDnsmasqConfig: overridable single-value options (no-hosts, addn-hosts,
  flags, dhcp-leasefile, cache-size, port, etc.) from dnsmasq source/docs.
- Hosts UI: allow editing when no-hosts but SystemHostsPath is in addn-hosts;
  HostsController and Hosts.razor check pathInAddnHosts.
- Config comments: managed file ensures one addn-hosts line in our file only;
  DnsmasqOptions/validator docs for SystemHostsPath and addn-hosts.
- Test harness: dnsmasq logs to /data/dnsmasq.log (log-facility + log-queries in
  dnsmasq-test.conf); entrypoint touches log file for write access.
- dnsmasq-status.sh: simulates systemctl status output in container (ps/pgrep);
  Dockerfile copies and chmod +x; StatusShowCommand/LogsCommand use script and
  tail /data/dnsmasq.log.
- Project: Models/Config namespace, typed HTTP clients, combined DHCP+Leases
  page, ProcessRunner, shared models (PascalCase).

scripts/dnsmasq-status.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+# Simulates "systemctl status dnsmasq" output when run in a container without systemd.
+# Uses ps/pgrep so the UI looks familiar. Usage: dnsmasq-status.sh
+
+pid=$(pgrep -x dnsmasq)
+if [ -z "$pid" ]; then
+  echo "● dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server"
+  echo "     Loaded: (container, no systemd)"
+  echo "     Active: inactive (dead)"
+  echo ""
+  exit 0
+fi
+
+# One ps + awk: parse pid,user,etime,rss,args and print systemctl-style (rss in KB -> MB)
+ps -o pid=,user=,etime=,rss=,args= -p "$pid" 2>/dev/null | awk '{
+  pid=$1; user=$2; etime=$3; rss=$4
+  args=""
+  for (i=5;i<=NF;i++) args = args (i>5?" ":"") $i
+  rss_mb = (rss+0) / 1024
+  if (rss_mb < 0.1) rss_mb = 0.0
+  printf "● dnsmasq.service - dnsmasq - A lightweight DHCP and caching DNS server\n"
+  printf "     Loaded: loaded (container, no systemd)\n"
+  printf "     Active: active (running) since container start\n"
+  printf "   Main PID: %s (dnsmasq)\n", pid
+  printf "      Tasks: 1 (limit: unknown)\n"
+  printf "     Memory: %.1fM\n", rss_mb
+  printf "        CPU: %s\n", etime
+  printf "     CGroup: (container)\n"
+  printf "             └─%s %s\n", pid, args
+}'
+exit 0