chore: update openiap-gql to 1.0.11 with type improvements (#17)

## Summary

Updates openiap-gql dependency from 1.0.9 to 1.0.11, bringing improved
type definitions with public initializers and new fields for alternative
billing support.

- **Type System Improvements**: Regenerated `Types.swift` with 19 new
public initializers for Input types, eliminating cross-module
initialization issues
- **Alternative Billing Support**: Added `AlternativeBillingModeAndroid`
enum and `InitConnectionConfig` struct
- **Enhanced Transaction Handling**: Improved ObjC bridge to use actual
transaction data from pending transactions
- **Field Naming Updates**: Renamed `externalPurchaseUrlOnIOS` →
`externalPurchaseUrl` for consistency

## Changes

### Dependencies
- Updated `openiap-gql` from 1.0.9 to 1.0.11 in `openiap-versions.json`

### Code Generation
- Fixed `generate-types.sh` script to properly copy generated files
- Regenerated `Sources/Models/Types.swift` with latest schema

### New Types & Fields
- `AlternativeBillingModeAndroid` enum (iOS alternative billing mode
support)
- `InitConnectionConfig` struct (connection configuration)
- `ActiveSubscription`: Added `currentPlanId`, `basePlanIdAndroid`,
`purchaseTokenAndroid` fields

### API Changes
- `externalPurchaseUrlOnIOS` → `externalPurchaseUrl` (breaking change)
- All Input types now have public initializers (improved DX for
cross-module usage)

### Implementation Improvements
- **`OpenIapModule+ObjC.swift`**: Enhanced
`finishTransactionWithPurchaseId` to fetch actual transaction data from
pending transactions before falling back to minimal data
- **`OpenIapSerialization.swift`**: Added helper methods for creating
Input types:
  - `requestSubscriptionIosProps()`
  - `requestPurchaseIosProps()`
  - `requestSubscriptionPropsByPlatforms()`
  - `requestPurchasePropsByPlatforms()`
- **`Example/AlternativeBillingScreen.swift`**: Simplified to use direct
initialization with new public initializers

## Breaking Changes

⚠️ **Field Rename**: `externalPurchaseUrlOnIOS` → `externalPurchaseUrl`

Update any code using this field:
```swift
// Before
let url = props.externalPurchaseUrlOnIOS

// After  
let url = props.externalPurchaseUrl
```

## Test Plan

- [x] swift test - All 10 tests passing
- [x] swift build - Package builds successfully
- [x] Example app builds and runs without errors
- [x] Alternative billing flow works correctly
- [x] Transaction finishing uses actual transaction data when available

Author: hyochan

Example/OpenIapExample/Screens/AlternativeBillingScreen.swift

@@ -329,22 +329,20 @@ struct AlternativeBillingScreen: View {
                 let request: RequestPurchaseProps.Request
                 if requestType == .subs {
                     let subscriptionProps = RequestSubscriptionIosProps(
-                        externalPurchaseUrlOnIOS: externalUrl,
+                        externalPurchaseUrl: externalUrl,
                         sku: product.id
                     )
 
                     request = .subscription(RequestSubscriptionPropsByPlatforms(
-                        android: nil,
                         ios: subscriptionProps
                     ))
                 } else {
                     let iosProps = RequestPurchaseIosProps(
-                        externalPurchaseUrlOnIOS: externalUrl,
+                        externalPurchaseUrl: externalUrl,
                         sku: product.id
                     )
 
                     request = .purchase(RequestPurchasePropsByPlatforms(
-                        android: nil,
                         ios: iosProps
                     ))
                 }