feat(ios): create paywall api (#13602)

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

## Summary by CodeRabbit

- New Features
- Introduced a new iOS Paywall plugin with a simple API to display a
paywall and receive a success response.
  - Added JavaScript wrapper and type definitions for easy integration.

- Refactor
  - Reorganized the iOS project structure for plugins.

- Chores
- Removed unused legacy iOS plugins to streamline the app and reduce
build complexity.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/apps/ios/App/App/Plugins/PayWall/PayWallPlugin.swift

@@ -0,0 +1,25 @@
+import Capacitor
+import Foundation
+
+@objc(PayWallPlugin)
+public class PayWallPlugin: CAPPlugin, CAPBridgedPlugin {
+  public let identifier = "PayWallPlugin"
+  public let jsName = "PayWall"
+  public let pluginMethods: [CAPPluginMethod] = [
+    CAPPluginMethod(name: "showPayWall", returnType: CAPPluginReturnPromise),
+  ]
+
+  @objc func showPayWall(_ call: CAPPluginCall) {
+    do {
+      let type = try call.getStringEnsure("type")
+
+      // TODO: Implement actual paywall logic here
+      // For now, just log the type and resolve
+      print("PayWall: Showing paywall of type: \(type)")
+
+      call.resolve(["success": true, "type": type])
+    } catch {
+      call.reject("Failed to show paywall", nil, error)
+    }
+  }
+}