Add AI auto-check worker, share link message/link fields, and update journal/settings UI

db/migration_share_links.sql

@@ -14,4 +14,8 @@ ALTER TABLE share_links ADD COLUMN IF NOT EXISTS access_password_hash VARCHAR(25
 -- UPDATE share_links SET expires_at = created_at + interval '7 days' WHERE expires_at IS NULL;
 
 -- 5. Add index for cleanup of expired links
-CREATE INDEX IF NOT EXISTS idx_share_links_expires_at ON share_links(expires_at);
+CREATE INDEX IF NOT EXISTS idx_share_links_expires_at ON share_links(expires_at);
+
+-- 6. Add public message and external link shown on the share page
+ALTER TABLE share_links ADD COLUMN IF NOT EXISTS message TEXT;
+ALTER TABLE share_links ADD COLUMN IF NOT EXISTS link_url VARCHAR(500);