fix(ios): complete iap user interface (#13639)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- New Features
- In-app purchases fully integrated for Pro and AI plans with restore,
live product loading, and StoreKit test configuration.

- Improvements
- Refreshed paywall: intro animation, delayed close button, smoother
horizontal paging, page dots interaction, per-item reveal animations,
and purchase-state UI (disabled/checked when owned).

- Changes
- "Believer" plan and related screens removed; Pro simplified to Monthly
and Annual offerings.

- Chores
- iOS project and build settings updated for newer toolchain and
StoreKit support.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

packages/frontend/apps/ios/App/App.xcodeproj/xcshareddata/xcschemes/AFFiNE.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1600"
+   LastUpgradeVersion = "2600"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"

packages/frontend/apps/ios/App/App.xcodeproj/xcshareddata/xcschemes/App.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1600"
+   LastUpgradeVersion = "2600"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -50,6 +50,9 @@
             ReferencedContainer = "container:App.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
+      <StoreKitConfigurationFileReference
+         identifier = "../App/Products.storekit">
+      </StoreKitConfigurationFileReference>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"