PocketBase as a standalone database server

The pocketbase driver no longer embeds PocketBase: Warp keeps its data as
PocketBase collections on a server of its own and reaches it only through
the REST API, the way the postgres driver reaches PostgreSQL.
database.connection_string is the server's URL, and Warp signs in as the
superuser in WARP_PB_SUPERUSER_EMAIL / WARP_PB_SUPERUSER_PASSWORD (or a
WARP_PB_SUPERUSER_FILE of the two).

Every SQL table is a superuser-only collection of the same name and
columns, created by warp migrate. Reads go through PocketBase's SQL
endpoint with the SQL drivers' queries, via a read-only database/sql
driver that inlines arguments, moves long ones into warp_params and pages
past 1000 rows. Writes are record operations in batch requests under one
write lock in the Warp process. Media is a protected file field in
warp_media, local or in the S3 bucket Warp writes into PocketBase's
settings. Search matches word prefixes with LIKE. The storage tests run
against an in-process PocketBase and pass as on SQLite.

Docker: the PocketBase stacks get a pocketbase service running
tajniak81/pocketbase-docker-root (WARP_PB_IMAGE), with a pb-data volume
and its admin UI on loopback; the AIO images run that PocketBase binary
as a process beside the homeserver, making up a superuser when none is
set. The .env examples, READMEs, docs and warp.yaml.example follow.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/go.mod

@@ -4,7 +4,6 @@ go 1.26.4
 
 require (
 	github.com/jackc/pgx/v5 v5.11.0
-	github.com/pocketbase/dbx v1.12.0
 	github.com/pocketbase/pocketbase v0.39.11
 	github.com/prometheus/client_golang v1.25.0
 	go.opentelemetry.io/otel v1.47.0
@@ -43,6 +42,7 @@ require (
 	github.com/mattn/go-isatty v0.0.24 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
+	github.com/pocketbase/dbx v1.12.0 // indirect
 	github.com/pocketbase/ozzo-validation/v4 v4.3.0 // indirect
 	github.com/prometheus/client_model v0.6.3 // indirect
 	github.com/prometheus/common v0.72.0 // indirect