feat(contact): CRO improvements — align services dropdown, value-prop H1, response promise above form, tighter message field

Addresses contact-page audit points 22–27:
- Confirmed no '200+ companies' credibility claim; canonical stat set retained
- Service dropdown now matches real services, led by ERP/Enterprise + Government IT;
  removed Cloud Services and AI & ML, added UI/UX Design
- Backend allowlist + labels updated to accept 'ui-ux' and reflect real service names
- H1 paired with value prop: free 1-page proposal in 24 hours
- '< 24h response' promise badge moved above the form
- Clarified contradictory hours to 'We reply within 24 business hours, Mon–Fri'
- Reduced message textarea height (rows 5→4) and max length (5000→2000)

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

.agents/backend-specialist/FORM_INTEGRATION.md

@@ -35,8 +35,8 @@ Both endpoints include server-side validation, rate limiting, spam protection, a
 - `name` — required, 2–100 characters
 - `email` — required, valid format, max 254 chars
 - `phone` — optional; if present, must match phone regex
-- `subject` — required, allowlist enum (web-development, mobile-development, cloud-services, ai-ml, consulting, support, other)
-- `message` — required, 10–5000 characters
+- `subject` — required, allowlist enum (erp-solutions, government-systems, web-development, mobile-development, ui-ux, consulting, other; legacy values cloud-services, ai-ml, support still accepted by the API but no longer offered in the contact-page dropdown)
+- `message` — required, 10–2000 characters
 - `website` — honeypot, must be empty
 
 **Rate limit:** 5 requests per IP per hour