privacy: only domain-anchored address resolvers; drop Cake endpoints

Address-field input no longer leaves the device except toward
infrastructure implied by the typed name itself:
- remove Twitter, Mastodon, Nostr, Yat, Unstoppable Domains, FIO,
  ThorChain-name, zcash.me, and Zano alias lookups (Nostr and FIO ran
  with no setting gate at all; Zano is not even a supported chain)
- keep OpenAlias, BIP-353, .well-known, LNURL, and ENS, each toggleable
  in Settings -> Domain lookups
- BTC fee/block/restore-height queries move from mempool.cakewallet.com
  to public mempool.space (also fixes two /api/v1 paths that 404 on
  standard mempool deployments)
- PRIVACY.md updated to disclose the remaining flows (mempool.space,
  name lookups, opt-in silent payments and payjoin); issue templates and
  the translation prompt de-Caked

lib/src/screens/settings/domain_lookups_page.dart

@@ -21,22 +21,6 @@ class DomainLookupsPage extends BasePage {
           padding: EdgeInsets.only(top: 10),
           child: Column(
             children: [
-              SettingsSwitcherCell(
-                  title: 'Twitter',
-                  value: _connectionsSyncViewModel.lookupTwitter,
-                  onValueChange: (_, bool value) => _connectionsSyncViewModel.setLookupsTwitter(value)),
-              SettingsSwitcherCell(
-                  title: 'Mastodon',
-                  value: _connectionsSyncViewModel.looksUpMastodon,
-                  onValueChange: (_, bool value) => _connectionsSyncViewModel.setLookupsMastodon(value)),
-              SettingsSwitcherCell(
-                  title: 'Yat service',
-                  value: _connectionsSyncViewModel.looksUpYatService,
-                  onValueChange: (_, bool value) => _connectionsSyncViewModel.setLookupsYatService(value)),
-              SettingsSwitcherCell(
-                  title: 'Unstoppable Domains',
-                  value: _connectionsSyncViewModel.looksUpUnstoppableDomains,
-                  onValueChange: (_, bool value) => _connectionsSyncViewModel.setLookupsUnstoppableDomains(value)),
               SettingsSwitcherCell(
                   title: 'OpenAlias',
                   value: _connectionsSyncViewModel.looksUpOpenAlias,
@@ -49,12 +33,6 @@ class DomainLookupsPage extends BasePage {
                   title: '.well-known',
                   value: _connectionsSyncViewModel.looksUpWellKnown,
                   onValueChange: (_, bool value) => _connectionsSyncViewModel.setLookupsWellKnown(value)),
-              SettingsSwitcherCell(
-                  title: 'Zano Aliases',
-                  value: _connectionsSyncViewModel.lookupsZanoAlias,
-                  onValueChange: (_, bool value) => _connectionsSyncViewModel.setLookupsZanoAlias(value)),
-
-              //if (!isHaven) it does not work correctly
             ],
           ),
         );