fix: correct API issues found by codex review across 10 CLIs

Fixes found by automated codex review of all 47 CLI tools:

- resend: webhook field name endpoint_url -> endpoint
- mailchimp: change from Bearer to Basic auth per API docs
- kit: fail fast when api_secret required but not set
- activecampaign: automation add-contact needs --contact-id not --email
- google-ads: budget updateMask must be snake_case (amount_micros)
- meta-ads: special_ad_categories default to ['NONE'] not empty array
- linkedin-ads: add required X-RestLi-Protocol-Version header
- onesignal: auth prefix should be Key, not Basic
- mixpanel: query dates must be YYYY-MM-DD, not relative strings
- wistia: change from Bearer to Basic auth per API docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tools/clis/meta-ads.js

@@ -93,7 +93,7 @@ async function main() {
             name: args.name,
             objective: args.objective,
             status: args.status || 'PAUSED',
-            special_ad_categories: [],
+            special_ad_categories: ['NONE'],
           }
           result = await api('POST', `/act_${accountId}/campaigns`, body)
           break