refactor(build): decouple per-module versioning

Each module uses its own version property instead of a shared
artefactVersion, so changes to one module no longer force a
version bump across all modules. CI now supports per-module
release tags with the format <module>/v<version>.

build.gradle.kts

@@ -20,9 +20,6 @@
  * SOFTWARE.
  */
 
-val artefactVersion: String by project
-
 subprojects {
     group = "com.onixbyte"
-    version = artefactVersion
 }