Refacto load all functions

Unbounded LoadAll* loaders materialised an entire result set in one
query with no ceiling. A table that is small in development can grow
without bound in production, so these loaders were a latent memory
and query-time hazard.

Remove the LoadAll* methods from pkg/coredata and walk the cursor-
paginated LoadBy* siblings instead through a shared page.LoadAll
helper. The helper advances a MaxCursorSize forward cursor until the
result set is exhausted and concatenates the pages. It caps a single
call at MaxLoadAllPages (20) batches of 500 rows and errors past that
rather than materialising an unbounded set, so a runaway caller fails
loudly instead of exhausting memory.

Callers that genuinely need every row now express that explicitly,
and the coredata load-naming rule and docs are updated to discourage
new unbounded loaders.

Signed-off-by: Sacha Al Himdani <sacha@probo.com>

pkg/coredata/cookie_banner_translation.go

@@ -27,6 +27,7 @@ import (
 	"go.gearno.de/kit/pg"
 	"go.probo.inc/probo/pkg/gid"
 	"go.probo.inc/probo/pkg/iam/policy"
+	"go.probo.inc/probo/pkg/page"
 )
 
 type (
@@ -43,6 +44,17 @@ type (
 	CookieBannerTranslations []*CookieBannerTranslation
 )
 
+func (t CookieBannerTranslation) CursorKey(field CookieBannerTranslationOrderField) page.CursorKey {
+	switch field {
+	case CookieBannerTranslationOrderFieldLanguage:
+		return page.NewCursorKey(t.ID, t.Language)
+	case CookieBannerTranslationOrderFieldCreatedAt:
+		return page.NewCursorKey(t.ID, t.CreatedAt)
+	}
+
+	panic(fmt.Sprintf("unsupported order by: %s", field))
+}
+
 func (t *CookieBannerTranslation) AuthorizationAttributes(
 	ctx context.Context,
 	conn pg.Querier,
@@ -181,11 +193,12 @@ LIMIT 1;
 	return nil
 }
 
-func (t *CookieBannerTranslations) LoadAllByCookieBannerID(
+func (t *CookieBannerTranslations) LoadByCookieBannerID(
 	ctx context.Context,
 	conn pg.Querier,
 	scope Scoper,
 	cookieBannerID gid.GID,
+	cursor *page.Cursor[CookieBannerTranslationOrderField],
 ) error {
 	q := `
 SELECT
@@ -201,14 +214,14 @@ FROM
 WHERE
 	%s
 	AND cookie_banner_id = @cookie_banner_id
-ORDER BY
-	language ASC;
+	AND %s
 `
 
-	q = fmt.Sprintf(q, scope.SQLFragment())
+	q = fmt.Sprintf(q, scope.SQLFragment(), cursor.SQLFragment())
 
 	args := pgx.StrictNamedArgs{"cookie_banner_id": cookieBannerID}
 	maps.Copy(args, scope.SQLArguments())
+	maps.Copy(args, cursor.SQLArguments())
 
 	rows, err := conn.Query(ctx, q, args)
 	if err != nil {