Add stable keys for special groups and SSL sync agent hooks.

English keys on store/website specials stay unique per business; domain-admin can trigger dashboard SSL sync.

Co-authored-by: Cursor <cursoragent@cursor.com>

database/migrations/050_special_group_keys.sql

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+-- Stable English keys for website special groups (display title stays free-language)
+
+ALTER TABLE store_specials
+  ADD COLUMN IF NOT EXISTS key VARCHAR(100);
+
+UPDATE store_specials
+SET key = 'special-' || id::text
+WHERE key IS NULL OR BTRIM(key) = '';
+
+ALTER TABLE store_specials
+  ALTER COLUMN key SET NOT NULL;
+
+CREATE UNIQUE INDEX IF NOT EXISTS store_specials_business_id_key_unique
+  ON store_specials (business_id, key);
+
+ALTER TABLE website_category_groups
+  ADD COLUMN IF NOT EXISTS key VARCHAR(100);
+
+UPDATE website_category_groups
+SET key = 'category-group-' || id::text
+WHERE key IS NULL OR BTRIM(key) = '';
+
+ALTER TABLE website_category_groups
+  ALTER COLUMN key SET NOT NULL;
+
+CREATE UNIQUE INDEX IF NOT EXISTS website_category_groups_business_id_key_unique
+  ON website_category_groups (business_id, key);
+
+ALTER TABLE website_brand_groups
+  ADD COLUMN IF NOT EXISTS key VARCHAR(100);
+
+UPDATE website_brand_groups
+SET key = 'brand-group-' || id::text
+WHERE key IS NULL OR BTRIM(key) = '';
+
+ALTER TABLE website_brand_groups
+  ALTER COLUMN key SET NOT NULL;
+
+CREATE UNIQUE INDEX IF NOT EXISTS website_brand_groups_business_id_key_unique
+  ON website_brand_groups (business_id, key);