feat: separate Public IP for DNS records from Server IP, improve settings help texts

- Add public_ip field to Settings for DNS A records (proxy/load balancer IP)
- DNS records now use public_ip, falling back to server_ip if empty
- Server IP renamed to "Server IP (Docker Host)" for clarity
- Public IP labeled "Public IP (DNS Target)"
- Updated help texts for domain, server IP, public IP, and Docker network
- DB migration + schema for public_ip column

web/src/lib/i18n/en.json

@@ -287,11 +287,13 @@
     "title": "General Settings",
     "globalConfig": "Global Configuration",
     "domain": "Domain",
-    "domainHelp": "Base domain for subdomain routing",
-    "serverIp": "Server IP",
-    "serverIpHelp": "Public IP address of the server",
+    "domainHelp": "Base domain for subdomain routing (e.g., example.com → stage-dev-app.example.com)",
+    "serverIp": "Server IP (Docker Host)",
+    "serverIpHelp": "IP of the machine running Docker. Used for NPM remote forwarding.",
+    "publicIp": "Public IP (DNS Target)",
+    "publicIpHelp": "IP for DNS A records — typically your proxy/load balancer. Falls back to Server IP if empty.",
     "dockerNetwork": "Docker Network",
-    "dockerNetworkHelp": "Docker network for deployed containers",
+    "dockerNetworkHelp": "Docker network that containers and proxy share. Must match your NPM/Traefik network.",
     "subdomainPattern": "Subdomain Pattern",
     "subdomainPatternHelp": "Pattern for auto-generated subdomains",
     "subdomainVarsTitle": "Available variables",

web/src/lib/i18n/ru.json

@@ -287,11 +287,13 @@
     "title": "Общие настройки",
     "globalConfig": "Глобальная конфигурация",
     "domain": "Домен",
-    "domainHelp": "Базовый домен для маршрутизации поддоменов",
-    "serverIp": "IP сервера",
-    "serverIpHelp": "Публичный IP-адрес сервера",
+    "domainHelp": "Базовый домен для маршрутизации (напр., example.com → stage-dev-app.example.com)",
+    "serverIp": "IP сервера (Docker Host)",
+    "serverIpHelp": "IP машины с Docker. Используется для удалённого NPM.",
+    "publicIp": "Публичный IP (для DNS)",
+    "publicIpHelp": "IP для DNS A-записей — обычно адрес прокси/балансировщика. Если пусто, используется IP сервера.",
     "dockerNetwork": "Docker-сеть",
-    "dockerNetworkHelp": "Docker-сеть для развёрнутых контейнеров",
+    "dockerNetworkHelp": "Docker-сеть, общая для контейнеров и прокси. Должна совпадать с сетью NPM/Traefik.",
     "subdomainPattern": "Шаблон поддомена",
     "subdomainPatternHelp": "Шаблон для автоматически генерируемых поддоменов",
     "subdomainVarsTitle": "Доступные переменные",

web/src/lib/types.ts

@@ -100,6 +100,7 @@ export interface RegistryImage {
 export interface Settings {
 	domain: string;
 	server_ip: string;
+	public_ip: string;
 	network: string;
 	subdomain_pattern: string;
 	notification_url: string;

web/src/routes/settings/+page.svelte

@@ -15,6 +15,7 @@
 
 	let domain = $state('');
 	let serverIp = $state('');
+	let publicIp = $state('');
 	let network = $state('');
 	let subdomainPattern = $state('');
 	let pollingInterval = $state('');
@@ -118,6 +119,7 @@
 			const settings = await getSettings();
 			domain = settings.domain ?? '';
 			serverIp = settings.server_ip ?? '';
+			publicIp = settings.public_ip ?? '';
 			network = settings.network ?? '';
 			subdomainPattern = settings.subdomain_pattern ?? '';
 			pollingInterval = parseDurationToSeconds(settings.polling_interval ?? '60');
@@ -148,7 +150,7 @@
 		saving = true;
 		try {
 			const payload: Record<string, unknown> = {
-				domain: domain.trim(), server_ip: serverIp.trim(), network: network.trim(),
+				domain: domain.trim(), server_ip: serverIp.trim(), public_ip: publicIp.trim(), network: network.trim(),
 				subdomain_pattern: subdomainPattern.trim(), polling_interval: secondsToDuration(pollingInterval),
 				base_volume_path: baseVolumePath.trim(), notification_url: notificationUrl.trim(),
 				proxy_provider: proxyProvider,
@@ -271,7 +273,8 @@
 			<h2 class="mb-4 text-lg font-semibold text-[var(--text-primary)]">{$t('settingsGeneral.globalConfig')}</h2>
 			<div class="grid grid-cols-1 gap-4 md:grid-cols-2">
 				<FormField label={$t('settingsGeneral.domain')} name="domain" bind:value={domain} placeholder="example.com" error={errors.domain ?? ''} helpText={$t('settingsGeneral.domainHelp')} />
-				<FormField label={$t('settingsGeneral.serverIp')} name="serverIp" bind:value={serverIp} placeholder="93.84.96.191" error={errors.serverIp ?? ''} helpText={$t('settingsGeneral.serverIpHelp')} />
+				<FormField label={$t('settingsGeneral.serverIp')} name="serverIp" bind:value={serverIp} placeholder="192.168.1.100" error={errors.serverIp ?? ''} helpText={$t('settingsGeneral.serverIpHelp')} />
+				<FormField label={$t('settingsGeneral.publicIp')} name="publicIp" bind:value={publicIp} placeholder="93.84.96.191" helpText={$t('settingsGeneral.publicIpHelp')} />
 				<FormField label={$t('settingsGeneral.dockerNetwork')} name="network" bind:value={network} placeholder="staging-net" helpText={$t('settingsGeneral.dockerNetworkHelp')} />
 				<div>
 					<div class="flex items-center gap-1.5">