chore: add missing source modules to version control

apix-demo, apix-portal/src, apix-spider/src, apix-registry/src,
apix-common/src were never staged. Without them the CI build has no
source to compile and the Docker images cannot be produced.

Also adds docs/ (infrastructure notes) missed in prior commits.

Co-Authored-By: Mira <noreply@anthropic.com>

apix-portal/src/main/resources/application.properties

@@ -0,0 +1,7 @@
+quarkus.http.port=8081
+quarkus.smallrye-health.root-path=/q/health
+quarkus.log.level=${LOG_LEVEL:INFO}
+
+quarkus.rest-client.registry.url=${APIX_REGISTRY_URL:https://api-index.org}
+quarkus.rest-client.registry.connect-timeout=3000
+quarkus.rest-client.registry.read-timeout=5000