feat: add domain rules management feature

- Introduced a new DomainRulesPage component for managing custom and global equivalent domains.
- Updated AppMainRoutes to include a route for domain rules.
- Added API functions to fetch and save domain rules.
- Enhanced localization with new strings for domain rules in multiple languages.
- Updated styles for the new domain rules interface and ensured responsiveness.
- Added types for domain rules in the TypeScript definitions.

webapp/src/lib/api/domains.ts

@@ -0,0 +1,62 @@
+import { t } from '@/lib/i18n';
+import type { DomainRules, TokenError } from '@/lib/types';
+import { parseErrorMessage, parseJson, type AuthedFetch } from './shared';
+
+function normalizeDomainsResponse(body: Partial<DomainRules> & Record<string, unknown>): DomainRules {
+  const equivalentDomains = Array.isArray(body.equivalentDomains)
+    ? body.equivalentDomains
+    : Array.isArray(body.EquivalentDomains)
+      ? body.EquivalentDomains as string[][]
+      : [];
+  const globalEquivalentDomains = Array.isArray(body.globalEquivalentDomains)
+    ? body.globalEquivalentDomains
+    : Array.isArray(body.GlobalEquivalentDomains)
+      ? body.GlobalEquivalentDomains as DomainRules['globalEquivalentDomains']
+      : [];
+  const customEquivalentDomains = Array.isArray(body.customEquivalentDomains)
+    ? body.customEquivalentDomains as DomainRules['customEquivalentDomains']
+    : Array.isArray(body.CustomEquivalentDomains)
+      ? body.CustomEquivalentDomains as DomainRules['customEquivalentDomains']
+      : equivalentDomains.map((domains, index) => ({
+          id: `custom:${index}`,
+          domains,
+          excluded: false,
+        }));
+
+  return {
+    equivalentDomains,
+    customEquivalentDomains,
+    globalEquivalentDomains,
+    object: 'domains',
+  };
+}
+
+export async function getDomainRules(authedFetch: AuthedFetch): Promise<DomainRules> {
+  const resp = await authedFetch('/api/settings/domains');
+  if (!resp.ok) throw new Error(await parseErrorMessage(resp, t('txt_domain_rules_load_failed')));
+  const body = await parseJson<Partial<DomainRules> & Record<string, unknown>>(resp);
+  if (!body) throw new Error(t('txt_domain_rules_invalid_response'));
+  return normalizeDomainsResponse(body);
+}
+
+export async function saveDomainRules(
+  authedFetch: AuthedFetch,
+  payload: {
+    customEquivalentDomains: DomainRules['customEquivalentDomains'];
+    equivalentDomains: string[][];
+    excludedGlobalEquivalentDomains: number[];
+  }
+): Promise<DomainRules> {
+  const resp = await authedFetch('/api/settings/domains', {
+    method: 'PUT',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(payload),
+  });
+  if (!resp.ok) {
+    const body = await parseJson<TokenError>(resp);
+    throw new Error(body?.error_description || body?.error || t('txt_domain_rules_save_failed'));
+  }
+  const body = await parseJson<Partial<DomainRules> & Record<string, unknown>>(resp);
+  if (!body) throw new Error(t('txt_domain_rules_invalid_response'));
+  return normalizeDomainsResponse(body);
+}