refactor(server): source build version from git tag

- Stamp version, channel and vendor into META-INF/build-info.properties
- Read build metadata at runtime from BuildProperties instead of expanded YAML
- Remove app.common placeholders from application.yaml
- Derive the OpenAPI info version from the packaged build version
- Point the OCI image source label at the GitHub repository
- Drop redundant repository blocks from settings.gradle.kts

server/Dockerfile.ci

@@ -12,7 +12,7 @@ LABEL org.opencontainers.image.title="ahsarah-guide-server" \
       org.opencontainers.image.description="REST API backend for Ahsarah Guide" \
       org.opencontainers.image.version="${IMAGE_VERSION}" \
       org.opencontainers.image.vendor="${IMAGE_VENDOR}" \
-      org.opencontainers.image.source="https://onixbyte.dev/onixbyte/ahsarah-guide" \
+      org.opencontainers.image.source="https://github.com/onixbyte/ahsarah-guide" \
       org.opencontainers.image.licenses="MIT" \
       org.opencontainers.image.created="${BUILD_DATE}"