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Adds configurable SPA route generation tasks.

• #kotlin
• #spa
• #routing
• #codegen

Generic npm/Node build lifecycle support, usable on any npm project (standalone SPA, library, or embedded frontend) regardless of whether a Java plugin is applied. Registers npmVersion, npmInstall, npmClean (wired into clean), npmRunBuild, and npmTest tasks. Optionally builds via nvm (Node Version Manager) instead of a system-installed npm. When org.sonarqube is already applied (directly or on a parent project), configures sonar.sources for the JS source tree.

• #convention
• #npm
• #node
• #frontend