Add cookie pattern analysis worker for prefix auto-detection

Background worker polls cookie_banners with pattern_analysis_requested_at
set, groups EXACT patterns sharing a common prefix, and merges groups of
3+ into a PREFIX pattern. Detection sets the flag when new EXACT patterns
are created. The worker relinks cookies, removes orphaned patterns, and
updates the draft version via ensureDraftVersionForBanner.

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

pkg/coredata/migrations/20260429T102803Z.sql

@@ -0,0 +1,16 @@
+-- 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 pattern_analysis_requested_at TIMESTAMP WITH TIME ZONE;