fix: use CI-standard Newman variable names (base_url, admin_user, admin_password)

CI workflow passes base_url/admin_user/admin_password but the collection
used baseUrl/username/password. Mismatched names caused Newman to silently
fall back to the collection default of http://localhost (port 80), which
nothing answers in CI — resulting in ECONNREFUSED.

Also updates default base_url to http://localhost:8080 to match the PHP
built-in server CI starts for Newman tests.

Author: WilcoLouwerse

tests/integration/README.md

@@ -15,11 +15,14 @@ enable-newman: true
 ```bash
 npm install -g newman
 newman run tests/integration/app-template.postman_collection.json \
-  --env-var baseUrl=http://localhost \
-  --env-var username=admin \
-  --env-var password=admin
+  --env-var base_url=http://nextcloud.local \
+  --env-var admin_user=admin \
+  --env-var admin_password=admin
 ```
 
+The variable names (`base_url`, `admin_user`, `admin_password`) match what the CI workflow passes.
+In CI the server runs on `http://localhost:8080` (PHP built-in server); locally use `http://nextcloud.local`.
+
 ## Structure
 
 Add your Postman collection JSON files to this directory. The CI runner picks up

tests/integration/app-template.postman_collection.json

@@ -10,29 +10,29 @@
 		"basic": [
 			{
 				"key": "username",
-				"value": "{{username}}",
+				"value": "{{admin_user}}",
 				"type": "string"
 			},
 			{
 				"key": "password",
-				"value": "{{password}}",
+				"value": "{{admin_password}}",
 				"type": "string"
 			}
 		]
 	},
 	"variable": [
 		{
-			"key": "baseUrl",
-			"value": "http://localhost",
+			"key": "base_url",
+			"value": "http://localhost:8080",
 			"type": "string"
 		},
 		{
-			"key": "username",
+			"key": "admin_user",
 			"value": "admin",
 			"type": "string"
 		},
 		{
-			"key": "password",
+			"key": "admin_password",
 			"value": "admin",
 			"type": "string"
 		}
@@ -45,7 +45,7 @@
 					"name": "Nextcloud status",
 					"request": {
 						"method": "GET",
-						"url": "{{baseUrl}}/status.php",
+						"url": "{{base_url}}/status.php",
 						"description": "Verify Nextcloud is running."
 					},
 					"event": [