Add i18n data structures for cookie banner

Add cookie_banner_translations table to store per-language
translations as JSONB, and a default_language column on
cookie_banners. Extend the version snapshot types to carry
translated UI strings and category content per language.

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/coredata/migrations/20260422T145821Z.sql

@@ -0,0 +1,30 @@
+-- Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+--
+-- Permission to use, copy, modify, and/or distribute this software for any
+-- purpose with or without fee is hereby granted, provided that the above
+-- copyright notice and this permission notice appear in all copies.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+-- REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+-- AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+-- INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+-- LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+-- OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+-- PERFORMANCE OF THIS SOFTWARE.
+
+ALTER TABLE cookie_banners ADD COLUMN default_language TEXT NOT NULL DEFAULT 'en';
+ALTER TABLE cookie_banners ALTER COLUMN default_language DROP DEFAULT;
+
+CREATE TABLE cookie_banner_translations (
+    id               TEXT PRIMARY KEY,
+    tenant_id        TEXT NOT NULL,
+    organization_id  TEXT NOT NULL,
+    cookie_banner_id TEXT NOT NULL REFERENCES cookie_banners(id) ON DELETE CASCADE,
+    language         TEXT NOT NULL,
+    translations     JSONB NOT NULL,
+    created_at       TIMESTAMP WITH TIME ZONE NOT NULL,
+    updated_at       TIMESTAMP WITH TIME ZONE NOT NULL
+);
+
+CREATE UNIQUE INDEX idx_cookie_banner_translations_unique_language_per_banner
+    ON cookie_banner_translations (cookie_banner_id, language);