refactor(docker): consolidate static file init service and update ports

Remove dedicated static-init service and run collectstatic in the init sidecar instead.
Static files baked into the image are copied to /mnt/static for nginx serving on each
deployment. Also update MCP and nginx ports and refresh external service hostnames
in comments.

docker/entrypoint.sh

@@ -63,6 +63,11 @@ case "$1" in
     # or library_type defaults need to change. A non-zero exit here blocks
     # `app`, `mcp`, and `worker` from starting.
     #
+    # collectstatic copies the static files baked into the image at build
+    # time (/app/staticfiles) into STATIC_ROOT (/mnt/static), which nginx
+    # serves directly. --clear removes any stale files from the previous
+    # deploy before copying, so deleted assets don't linger.
+    #
     # Neo4j vector-index creation is *deliberately not* bundled here. That
     # command (``setup_neo4j_indexes``) requires a system embedding model
     # with a configured ``vector_dimensions`` value, and that model is
@@ -71,7 +76,7 @@ case "$1" in
     # whole stack on it would make the admin unreachable — a chicken-and-
     # egg. Operator bootstrap flow:
     #
-    #   1. docker compose up           # init sidecar: migrate + load_library_types
+    #   1. docker compose up           # init sidecar: migrate + collectstatic + load_library_types
     #   2. browse to admin, configure system embedding model
     #   3. docker compose exec app python manage.py setup_neo4j_indexes
     #
@@ -80,6 +85,7 @@ case "$1" in
     # missing so this is visible, not silent.
     set -e
     python manage.py migrate --noinput
+    python manage.py collectstatic --noinput --clear
     python manage.py load_library_types
     ;;