feat(legal): add /policies, /contact, /promotions pages + MarketingFooter (#165)

Adds the three legal/contact pages needed for Stripe live-mode site review: /policies (consolidated customer policies — refunds, cancellation, legal restrictions, promotions), /contact (phone (470) 949-4131 + support/sales/billing/security inboxes), /promotions (stub satisfying §6.2 cross-ref).

Extracts the existing landing footer into components/common/MarketingFooter.tsx and mounts it on /pricing and /contact-sales so all four legal links are reachable from every marketing surface.

Privacy and Terms closing sections updated to point at /contact + /policies; stale hello@ mailto removed.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Co-authored-by: Michael Chihlas <michael@resolutionflow.com>
Co-committed-by: Michael Chihlas <michael@resolutionflow.com>

frontend/src/pages/LandingPage.tsx

@@ -2,6 +2,7 @@ import { useState, useEffect, useRef } from 'react'
 import { Link } from 'react-router-dom'
 import { PageMeta } from '@/components/common/PageMeta'
 import { useAppConfig } from '@/hooks/useAppConfig'
+import { MarketingFooter } from '@/components/common/MarketingFooter'
 import '@/styles/landing.css'
 
 const FAQ_ITEMS = [
@@ -410,29 +411,7 @@ export default function LandingPage() {
             </div>
           </section>
 
-          {/* Footer */}
-          <footer className="landing-footer">
-            <div className="landing-footer-inner">
-              <div className="landing-footer-left">
-                <div className="landing-nav-logo-icon" style={{ width: 24, height: 24, borderRadius: 6 }}>
-                  <svg viewBox="0 0 24 24" fill="none" stroke="#000" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round" style={{ width: 14, height: 14 }}>
-                    <circle cx="12" cy="5" r="2" />
-                    <line x1="12" y1="7" x2="12" y2="11" />
-                    <circle cx="6" cy="15" r="2" />
-                    <circle cx="18" cy="15" r="2" />
-                    <line x1="12" y1="11" x2="6" y2="13" />
-                    <line x1="12" y1="11" x2="18" y2="13" />
-                  </svg>
-                </div>
-                <span className="landing-footer-copy">&copy; 2026 ResolutionFlow</span>
-              </div>
-              <ul className="landing-footer-links">
-                <li><Link to="/privacy">Privacy</Link></li>
-                <li><Link to="/terms">Terms</Link></li>
-                <li><a href="mailto:hello@resolutionflow.com">Contact</a></li>
-              </ul>
-            </div>
-          </footer>
+          <MarketingFooter />
         </main>
       </div>
     </>