Change gradle property from npr.url to npr.apiUrl

Update gradle property name for registry URL configuration to be more
descriptive and consistent with API naming conventions.

- Update RegistryPublishConfig to use npr.apiUrl instead of npr.url
- Update README documentation and examples
- Update unit test to use correct property name

Now both gradle property names are consistent:
- npr.apiUrl for registry URL
- npr.apiKey for API key

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: pditommaso

README.md

@@ -55,7 +55,7 @@ The registry publishing configuration supports multiple ways to provide the URL
 #### Registry URL
 The registry URL can be configured via (in order of priority):
 1. `nextflowPlugin.publishing.registry.url` in build.gradle
-2. Gradle property: `-Pnpr.url=https://your-registry.com/api`
+2. Gradle property: `-Pnpr.apiUrl=https://your-registry.com/api`
 3. Environment variable: `NPR_API_URL=https://your-registry.com/api`
 4. Default: `https://plugin-registry.seqera.io/api`
 
@@ -71,7 +71,7 @@ The API key can be configured via (in order of priority):
 
 Using gradle.properties:
 ```properties
-npr.url=https://my-custom-registry.com/api
+npr.apiUrl=https://my-custom-registry.com/api
 npr.apiKey=your-secret-api-key
 ```
 

src/main/groovy/io/nextflow/gradle/registry/RegistryPublishConfig.groovy

@@ -31,7 +31,7 @@ class RegistryPublishConfig {
         }
 
         // Try gradle property
-        def gradleProp = project.findProperty('npr.url')
+        def gradleProp = project.findProperty('npr.apiUrl')
         if (gradleProp) {
             return gradleProp.toString()
         }

src/test/groovy/io/nextflow/gradle/NextflowPluginTest.groovy

@@ -101,7 +101,7 @@ class NextflowPluginTest extends Specification {
 
     def "should resolve registry URL from gradle property"() {
         given:
-        project.ext.set('npr.url', 'https://gradle-prop-registry.com/api')
+        project.ext.set('npr.apiUrl', 'https://gradle-prop-registry.com/api')
         def config = new RegistryPublishConfig(project)
 
         when:
@@ -122,7 +122,7 @@ class NextflowPluginTest extends Specification {
                 }
 
                 // Try gradle property
-                def gradleProp = project.findProperty('npr.url')
+                def gradleProp = project.findProperty('npr.apiUrl')
                 if (gradleProp) {
                     return gradleProp.toString()
                 }