Ad reporting + featured rotates one link + clear campaign form on submit

- Ad reporting (auto-approved ads need a safety valve): new reports.js store
  (dual-mode) + ad_reports table + POST /api/report-ad; a "⚠ report" control on
  served ad slots opens a reason prompt and notifies the admin by email
  (siteConfig.adminEmail / ADMIN_EMAIL).
- Featured links now show ONE link at a time and cycle (true rotation), instead
  of listing all links at once.
- Campaign form now clears EVERY field on submit (target/creative/title/etc.).
  A leftover target URL was carrying into the next campaign — the same reason a
  video short was saved with the wrong (massifly) CTA target.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

db.js

@@ -142,6 +142,16 @@ async function bootstrap() {
   // per-account chat settings: availability toggle (default on) + muted-member list (JSON emails)
   await alterSafe('ALTER TABLE accounts ADD COLUMN chat_available TINYINT NOT NULL DEFAULT 1');
   await alterSafe('ALTER TABLE accounts ADD COLUMN chat_mutes VARCHAR(4000) NULL');
+  await q(`CREATE TABLE IF NOT EXISTS ad_reports (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    campaign_id INT NOT NULL,
+    reporter VARCHAR(190) NOT NULL DEFAULT '',
+    reason VARCHAR(20) NOT NULL,
+    note VARCHAR(600) NULL,
+    ts BIGINT NOT NULL,
+    resolved TINYINT NOT NULL DEFAULT 0,
+    INDEX (resolved, ts), INDEX (campaign_id)
+  ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`);
   await q(`CREATE TABLE IF NOT EXISTS burns (
     id VARCHAR(32) PRIMARY KEY,
     member_id INT NOT NULL,