catalog: Add iOS 27 beta 7 + cloudOS 26.4 firmware pairing

Add iPhone17,3 iOS 27.0 beta 7 (24A5424a) paired with cloudOS 26.4 to the
firmware catalog so it appears in the `fw prepare` picker, `fw catalog`,
and the `--json` report. Document it in the Tested Environments table
across README.md and the ja/ko/zh translations. Bump the hardcoded
pairing/menu count in FirmwarePickerTests 21 -> 22.

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Ej64m761KR33KaNYh3BuTo

tests/VPhoneCoreTests/FirmwarePickerTests.swift

@@ -10,8 +10,8 @@ struct FirmwarePickerTests {
 
     // MARK: - Catalog integrity
 
-    @Test func catalogHasTwentyOnePairings() {
-        #expect(VPhoneFirmwareCatalog.pairings.count == 21)
+    @Test func catalogHasTwentyTwoPairings() {
+        #expect(VPhoneFirmwareCatalog.pairings.count == 22)
     }
 
     @Test func everyPairingIsPopulated() {
@@ -106,7 +106,7 @@ struct FirmwarePickerTests {
             iphone: nil, cloudos: nil, isInteractive: true,
             read: reader(["1"]), write: { lines.append($0) })
         let menu = lines.filter { $0.hasPrefix("  [") }
-        #expect(menu.count == 21)
+        #expect(menu.count == 22)
         // Label text starts in one column regardless of 1- vs 2-digit index.
         let labelStarts = Set(menu.map { $0.range(of: "] ")!.upperBound.utf16Offset(in: $0) })
         #expect(labelStarts.count == 1)