Docker: a build context that isn't 3.6GB, and health you can see

The all-in-one image builds from the project root, and Docker only reads
.dockerignore from the context root — so the ones under "API Server" and
"Web App" never applied to it and every AIO build shipped the whole tree,
"Phone App/build" included. A root .dockerignore allow-lists the paths that
build actually copies.

The dev split stack passed neither PB_BOOTSTRAP nor the SUPERADMIN vars, so
it created the schema and then no user to log in with. It passes them now,
and .env.example says so.

WEBAPP_URL was never set anywhere, leaving the panel status page probing
localhost:8090 — itself — and always reporting the Web App as down. Each
compose file now points it at wherever the Web App really is, and the BFF
grew a real /healthz instead of letting the SPA fallback answer probes with
index.html and look healthy no matter what.

In the AIO, PocketBase and the API Server drop to an unprivileged user;
only nginx stays root to bind :80. The entrypoint takes ownership of the
two volumes first, so data written by the old root-only image stays
writable. All three images carry a HEALTHCHECK, every compose file declares
one too (so depends_on still gates against an older pulled image), and
web-app waits for the API Server to be serving rather than merely started.

Also: pinned alpine/golang/node and PocketBase 0.39.11, so a rebuild months
from now produces the same image; nginx forwards WebSocket upgrades instead
of stripping them, with the map in http.d where Alpine actually reads it;
and a .gitattributes keeps entrypoint.sh on LF, because a CRLF shebang from
a Windows clone fails at container start with "no such file or directory".

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Docker/.env.example

@@ -4,6 +4,17 @@
 PB_ADMIN_EMAIL=admin@example.com
 PB_ADMIN_PASSWORD=change-me-long-password
 
+# --- DriverVault super-admin (app login) -------------------------------------
+# The first application user, created by the API Server on boot with role
+# "superadmin" if no user with this email exists yet. Leave these blank and the
+# schema is still created but no user is, leaving a stack you cannot log into.
+DRIVERVAULT_SUPERADMIN_EMAIL=owner@example.com
+DRIVERVAULT_SUPERADMIN_PASSWORD=change-me-long-password
+DRIVERVAULT_SUPERADMIN_NAME=Administrator
+
+# Set to false to skip schema creation/reconcile once the database is set up.
+PB_BOOTSTRAP=true
+
 # --- API Server -------------------------------------------------------------
 # Allowed CORS origin(s) for the web app (match WEB_PORT / your public URL).
 # Native mobile apps are not subject to CORS.