Bump to 0.5.4: SafariIos profile + Chrome fingerprint alignment + locale helper

- New BrowserProfile::SafariIos mapped to BrowserVariant::SafariIos26.
  Built on wreq_util::Emulation::SafariIos26 with 4 overrides (TLS
  extension order, HTTP/2 HEADERS priority, real Safari iOS 26 headers,
  gzip/deflate/br). Matches bogdanfinn safari_ios_26_0 JA3
  8d909525bd5bbb79f133d11cc05159fe exactly. Empirically 9/10 on
  immobiliare.it with country-it residential.

- BrowserProfile::Chrome aligned to bogdanfinn chrome_133: dropped
  MAX_CONCURRENT_STREAMS from H2 SETTINGS, priority weight 256,
  explicit extension_permutation, advertise h3 in ALPN and ALPS.
  JA3 43067709b025da334de1279a120f8e14, akamai_fp
  52d84b11737d980aef856699f885ca86. Fixes indeed.com and other
  Cloudflare-fronted sites.

- New locale module: accept_language_for_url / accept_language_for_tld.
  TLD to Accept-Language mapping, unknown TLDs default to en-US.
  DataDome geo-vs-locale cross-checks are now trivially satisfiable.

- wreq-util bumped 2.2.6 to 3.0.0-rc.10 for Emulation::SafariIos26.

crates/webclaw-fetch/src/browser.rs

@@ -7,6 +7,10 @@ pub enum BrowserProfile {
     #[default]
     Chrome,
     Firefox,
+    /// Safari iOS 26 (iPhone). The one profile proven to defeat
+    /// DataDome's immobiliare.it / idealista.it / target.com-class
+    /// rules when paired with a country-scoped residential proxy.
+    SafariIos,
     /// Randomly pick from all available profiles on each request.
     Random,
 }
@@ -18,6 +22,7 @@ pub enum BrowserVariant {
     ChromeMacos,
     Firefox,
     Safari,
+    SafariIos26,
     Edge,
 }