feat(api-service): finish health check, (Wrap-up)shared-libs util & integration and all tests

Author: gracemann365

api-service/src/main/java/com/openpay/api/controller/HealthController.java

@@ -0,0 +1,12 @@
+package com.openpay.api.controller;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class HealthController {
+    @GetMapping("/health")
+    public String health() {
+        return "UP";
+    }
+}

api-service/src/main/java/com/openpay/api/controller/StatusController.java

@@ -10,8 +10,6 @@
 
 import com.openpay.api.model.TransactionEntity;
 import com.openpay.api.repository.TransactionRepository;
-
-// *** THIS IS THE ONLY CHANGE NEEDED: ***
 import com.openpay.shared.dto.StatusResponse;
 
 @RestController

api-service/src/main/java/com/openpay/api/controller/TransactionController.java

@@ -3,7 +3,7 @@
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RequestHeader; // <-- Add this import
+import org.springframework.web.bind.annotation.RequestHeader; 
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;