build: skip Javadoc generation for demo modules

Configure build to skip Javadoc tasks for all demo modules since they are
example applications not part of the published API. This reduces build time
and avoids generating unnecessary documentation for non-library code.

- Add condition in root build.gradle to skip Javadoc for :demos: modules
- Skip both javadoc and javadocJar tasks using onlyIf { false }
- Keep Javadoc enabled for main library modules (redis-om-spring, redis-om-spring-ai)

Author: bsbodden

build.gradle

@@ -21,6 +21,16 @@ apply from: "spotless.gradle"
 
 subprojects {
 	apply from: "$rootDir/gradle/build-conventions.gradle"
+
+	// Skip Javadoc for demo modules
+	if (project.path.startsWith(':demos:')) {
+		tasks.withType(Javadoc) {
+			onlyIf { false }
+		}
+		tasks.matching { it.name == 'javadocJar' }.configureEach {
+			onlyIf { false }
+		}
+	}
 }
 
 tasks.register('aggregateTestReport', TestReport) {

demos/build.gradle

@@ -18,6 +18,8 @@ tasks.matching { it.name.startsWith('publish') }.configureEach {
 	enabled = false
 }
 
+// Javadoc generation is disabled for demo modules in the root build.gradle
+
 repositories {
 	mavenLocal()
 	mavenCentral()