refactor(google): unify horizon and play flavors with independent deps (#19)

Completely separated Horizon and Play flavors by moving all
flavor-specific code to independent source sets (src/horizon and
src/play), unified both flavors to use identical package names
(dev.hyo.openiap) and class names (OpenIapModule), standardized
constructor signatures to remove appId parameter (Horizon reads from
AndroidManifest.xml instead), and replaced GlobalScope with scoped
CoroutineScope for proper lifecycle management and memory safety.


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

* **New Features**
* VS Code workspace: recommended extensions, launch configs, settings
and tasks for iOS/Android/GraphQL.
  * Android ViewModel added for easier billing UI integration.
  * New Alternative Billing Mode to support alternative billing flows.

* **Documentation**
* Horizon setup updated: explicit build-flavor selection (Play default)
instead of automatic detection.

* **Refactor**
* Billing flavor handling streamlined; Play is now the default and
Horizon wiring consolidated.

* **Bug Fixes**
  * Error messages/codes standardized for billing-related errors.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: hyochan

.github/workflows/ci.yml

@@ -22,7 +22,14 @@ jobs:
           bun-version: 1.1.0
 
       - name: Install dependencies
-        run: bun install
+        run: |
+          # Retry bun install up to 3 times to handle transient registry errors
+          for i in 1 2 3; do
+            bun install && break
+            [ $i -eq 3 ] && exit 1
+            echo "Attempt $i failed. Retrying..."
+            sleep 5
+          done
 
       - name: Generate types
         working-directory: packages/gql
@@ -56,7 +63,14 @@ jobs:
           bun-version: 1.1.0
 
       - name: Install dependencies
-        run: bun install
+        run: |
+          # Retry bun install up to 3 times to handle transient registry errors
+          for i in 1 2 3; do
+            bun install && break
+            [ $i -eq 3 ] && exit 1
+            echo "Attempt $i failed. Retrying..."
+            sleep 5
+          done
 
       - name: Generate types
         working-directory: packages/google
@@ -88,7 +102,14 @@ jobs:
           bun-version: 1.1.0
 
       - name: Install dependencies
-        run: bun install
+        run: |
+          # Retry bun install up to 3 times to handle transient registry errors
+          for i in 1 2 3; do
+            bun install && break
+            [ $i -eq 3 ] && exit 1
+            echo "Attempt $i failed. Retrying..."
+            sleep 5
+          done
 
       - name: Generate types
         working-directory: packages/apple
@@ -115,7 +136,14 @@ jobs:
           bun-version: 1.1.0
 
       - name: Install dependencies
-        run: bun install
+        run: |
+          # Retry bun install up to 3 times to handle transient registry errors
+          for i in 1 2 3; do
+            bun install && break
+            [ $i -eq 3 ] && exit 1
+            echo "Attempt $i failed. Retrying..."
+            sleep 5
+          done
 
       - name: Type check
         working-directory: packages/docs

.gitignore

@@ -18,7 +18,6 @@ packages/apple/Sources/openiap-versions.json
 Thumbs.db
 
 # IDE
-.vscode/
 .idea/
 *.swp
 *.swo

.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+    "recommendations": [
+        "vscjava.vscode-java-pack",
+        "vscjava.vscode-gradle",
+        "sswg.swift-lang",
+        "oven.bun-vscode",
+        "dbaeumer.vscode-eslint",
+        "esbenp.prettier-vscode"
+    ]
+}

.vscode/launch.json

@@ -0,0 +1,38 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node-terminal",
+            "request": "launch",
+            "name": "🍎 Open Apple (iOS) in Xcode",
+            "command": "open Example/Martie.xcodeproj",
+            "cwd": "${workspaceFolder}/packages/apple"
+        },
+        {
+            "name": "🤖 Open Google (Android) in Android Studio",
+            "type": "node",
+            "request": "launch",
+            "runtimeExecutable": "bash",
+            "runtimeArgs": [
+                "-lc",
+                "./scripts/open-android-studio.sh"
+            ],
+            "cwd": "${workspaceFolder}/packages/google",
+            "console": "integratedTerminal"
+        },
+        {
+            "type": "node-terminal",
+            "request": "launch",
+            "name": "📝 GQL: Generate Types",
+            "command": "bun run generate",
+            "cwd": "${workspaceFolder}/packages/gql"
+        },
+        {
+            "type": "node-terminal",
+            "request": "launch",
+            "name": "📚 Docs: Dev Server",
+            "command": "bun run dev",
+            "cwd": "${workspaceFolder}/packages/docs"
+        }
+    ]
+}

.vscode/settings.json

@@ -0,0 +1,44 @@
+{
+  "cSpell.words": [
+    "hyodotdev",
+    "openiap"
+  ],
+  "files.associations": {
+    "*.podspec": "ruby"
+  },
+  "files.exclude": {
+    "**/.build": true,
+    "**/.gradle": true,
+    "**/build": true,
+    "**/node_modules": true,
+    "**/.DS_Store": true
+  },
+  "search.exclude": {
+    "**/node_modules": true,
+    "**/.build": true,
+    "**/.gradle": true,
+    "**/build": true,
+    "**/dist": true
+  },
+  "[typescript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true
+  },
+  "[javascript]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true
+  },
+  "[json]": {
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true
+  },
+  "[swift]": {
+    "editor.tabSize": 4,
+    "editor.insertSpaces": true
+  },
+  "[kotlin]": {
+    "editor.tabSize": 4,
+    "editor.insertSpaces": true
+  },
+  "java.configuration.updateBuildConfiguration": "automatic"
+}