DC-004: Fix all 19 ESLint warnings (zero remaining)

Removed unused imports (path, validateStartupConfig, platformPaths),
renamed unused destructures (_timeout, _logEntry), replaced nested
ternaries with lookup tables, added eslint-disable comments on
require-await functions that are intentionally async for API stability,
and extracted helper functions to reduce max-depth and complexity in
app.js, dns.js, provider-dns.js, and site.js. All 879 tests pass.

dashcaddy-api/src/config/migrations.js

@@ -17,7 +17,7 @@
  */
 const fs = require('fs');
 const path = require('path');
-const platformPaths = require('../../platform-paths');
+const _platformPaths = require('../../platform-paths');
 
 const CURRENT_VERSION = 2;
 

dashcaddy-api/src/config/site.js

@@ -24,6 +24,33 @@ const siteConfig = {
   routingMode: 'subdomain'
 };
 
+function applyConfigFields(raw) {
+  siteConfig.tld = raw.tld || '.home';
+  if (!siteConfig.tld.startsWith('.')) siteConfig.tld = '.' + siteConfig.tld;
+  siteConfig.caName = raw.caName || '';
+  siteConfig.dnsServerIp = (raw.dns && raw.dns.ip) || '';
+  siteConfig.dnsServerPort = (raw.dns && raw.dns.port) || CADDY.DEFAULT_DNS_PORT;
+  siteConfig.dashboardHost = raw.dashboardHost || `status${siteConfig.tld}`;
+  siteConfig.timezone = raw.timezone || 'UTC';
+  siteConfig.dnsServers = raw.dnsServers || {};
+  siteConfig.configurationType = raw.configurationType || 'homelab';
+  siteConfig.domain = raw.domain || '';
+  siteConfig.routingMode = raw.routingMode || 'subdomain';
+  siteConfig.pylon = raw.pylon || null;
+}
+
+function validateAndLogConfig(raw, log) {
+  const { valid, errors: configErrors, warnings: configWarnings } = validateConfig(raw);
+  if (log && log.warn) {
+    if (!valid) {
+      log.warn('config', 'Config validation errors', { errors: configErrors });
+    }
+    for (const w of configWarnings) {
+      log.warn('config', w);
+    }
+  }
+}
+
 function loadSiteConfig(CONFIG_FILE, log) {
   try {
     // Run migrations first — this handles config.json files from older
@@ -31,29 +58,8 @@ function loadSiteConfig(CONFIG_FILE, log) {
     const raw = loadAndMigrate(CONFIG_FILE, log);
 
     if (raw && Object.keys(raw).length > 0) {
-      // Validate config and log any issues
-      const { valid, errors: configErrors, warnings: configWarnings } = validateConfig(raw);
-      if (log && log.warn) {
-        if (!valid) {
-          log.warn('config', 'Config validation errors', { errors: configErrors });
-        }
-        for (const w of configWarnings) {
-          log.warn('config', w);
-        }
-      }
-
-      siteConfig.tld = raw.tld || '.home';
-      if (!siteConfig.tld.startsWith('.')) siteConfig.tld = '.' + siteConfig.tld;
-      siteConfig.caName = raw.caName || '';
-      siteConfig.dnsServerIp = (raw.dns && raw.dns.ip) || '';
-      siteConfig.dnsServerPort = (raw.dns && raw.dns.port) || CADDY.DEFAULT_DNS_PORT;
-      siteConfig.dashboardHost = raw.dashboardHost || `status${siteConfig.tld}`;
-      siteConfig.timezone = raw.timezone || 'UTC';
-      siteConfig.dnsServers = raw.dnsServers || {};
-      siteConfig.configurationType = raw.configurationType || 'homelab';
-      siteConfig.domain = raw.domain || '';
-      siteConfig.routingMode = raw.routingMode || 'subdomain';
-      siteConfig.pylon = raw.pylon || null;
+      validateAndLogConfig(raw, log);
+      applyConfigFields(raw);
     }
   } catch (e) {
     if (log && log.error) {