fix(ci): use Release + archive/export for Firebase OTA distribution

- Switch from Debug build to Release archive with xcodebuild archive
- Use xcodebuild -exportArchive with ad-hoc exportOptions.plist for
  proper Ad Hoc distribution signing (required for Firebase OTA installs)
- Fix CFBundleVersion mismatch in Info.plist (1 → 2) to match project.yml
- Create Config/exportOptions.plist with method=ad-hoc and team 2MJF39L8VY

Previously Debug builds produced a Development provisioning profile that
doesn't include the tester's iPhone UDID, causing 'cannot be installed'.

.gitea/workflows/pr-iphone-deploy.yml

@@ -84,14 +84,15 @@ jobs:
             -project TabataGo.xcodeproj \
             -scmProvider system
 
-      - name: Build app
+      - name: Archive app
         run: |
           cd tabatago-swift
           xcodebuild -list
-          xcodebuild build \
+          xcodebuild archive \
             -project TabataGo.xcodeproj \
             -scheme TabataGo \
-            -configuration Debug \
+            -configuration Release \
+            -archivePath ../build/TabataGo.xcarchive \
             -allowProvisioningUpdates \
             -skipPackagePluginValidation \
             -derivedDataPath ../build/derived \
@@ -101,14 +102,15 @@ jobs:
             CODE_SIGN_STYLE=Automatic \
             DEVELOPMENT_TEAM=2MJF39L8VY
 
-      - name: Package IPA
+      - name: Export IPA (Ad Hoc)
         run: |
           cd tabatago-swift
-          mkdir -p Payload build
-          APP=$(find ../build/derived -name 'TabataGo.app' -type d | head -1)
-          cp -R "$APP" Payload/
-          zip -r build/TabataGo.ipa Payload/
-          rm -rf Payload
+          mkdir -p build
+          xcodebuild -exportArchive \
+            -archivePath ../build/TabataGo.xcarchive \
+            -exportPath build \
+            -exportOptionsPlist Config/exportOptions.plist \
+            -allowProvisioningUpdates
 
       - name: Deploy to Firebase
         env: