Ref(DeviceInfo-PaymentResult-WebView):

- Refactor `PaymentResultEntity` to include a nested `PaymentResultDataEntity` and companion factory methods for success and failure.
- Update `PaymentResultStatus` enum members from `OK`/`ERROR` to `SUCCESS`/`FAILURE`.
- Modify `PspService` and its implementations (`P3`, `PS4`, `Stage`) to return a non-nullable `PaymentResultEntity`.
- Enhance `PspWebView` with improved instance lifecycle management, `rememberUpdatedState` for callbacks, and new `onWebViewReady` and `onPageFinished` hooks.
- Optimize `PspWebView` to prevent redundant `loadUrl` calls during recomposition.
- Add `README.md` and `AGENT.md` to provide project architecture overviews and hardware-specific development guidelines.
- Update `TisWebViewScreen` and `StageWebViewScreen` to handle the refactored result models and utilize new WebView callbacks.

core/src/main/java/com/example/core/domain/PspService.kt

@@ -12,5 +12,5 @@ interface PspService {
         fun decodePosResponse(
         id: String?,
         activityResult: ActivityResult
-    ): PaymentResultEntity?
+    ): PaymentResultEntity
 }

core/src/main/java/com/example/core/model/PaymentResultEntity.kt

@@ -1,15 +1,48 @@
 package com.example.core.model
 
+import com.google.gson.annotations.SerializedName
+
 data class PaymentResultEntity(
-    val id : String? = null,
-    val status : PaymentResultStatus,
-    val terminalId : String,
-    val stan : String,
-    val rrn : String,
-    val responseCode : String,
-    val customerCardNO : String,
-    val transactionDateTime : String,
-    val description : String?,
+    val id: String? = null,
+    val status: PaymentResultStatus,
+    val message: String?,
+    @SerializedName("data")
+    val paymentResultDataEntity: PaymentResultDataEntity? = null,
+) {
+    data class PaymentResultDataEntity(
+        val terminalId: String,
+        val stan: String,
+        val rrn: String,
+        val responseCode: String,
+        val customerCardNO: String,
+        val transactionDateTime: String,
+    )
 
+    companion object {
+        fun success(
+            id: String? = null,
+            message: String? = "Success",
+            data: PaymentResultDataEntity? = null
+        ): PaymentResultEntity {
+            return PaymentResultEntity(
+                id = id,
+                status = PaymentResultStatus.SUCCESS,
+                message = message,
+                paymentResultDataEntity = data
+            )
+        }
 
-)
+        fun failure(
+            id: String? = null,
+            message: String? = "Failure",
+            data: PaymentResultDataEntity? = null
+        ): PaymentResultEntity {
+            return PaymentResultEntity(
+                id = id,
+                status = PaymentResultStatus.FAILURE,
+                message = message,
+                paymentResultDataEntity = data
+            )
+        }
+    }
+}

core/src/main/java/com/example/core/model/PaymentResultStatus.kt

@@ -1,6 +1,6 @@
 package com.example.core.model
 
 enum class PaymentResultStatus {
-    OK,
-    ERROR
+    SUCCESS,
+    FAILURE
 }