feat(sales): redirect beta-signup to /register; queue waitlist emails

Phase 2 retires the public beta-signup form in favor of the self-serve
register flow. The /api/v1/beta-signup POST endpoint stays mounted but
now responds with 307 to /register?from=beta so any external links keep
working and analytics can tag signup origin via the from query param.

Note: there is no beta_signup table in the schema — the original
endpoint only fired an email notification, so there is no waitlist to
read and no migration to run for the email-sent_at field. The one-off
admin script in the spec is therefore a no-op and is intentionally not
added here.

- Replace POST /beta-signup handler with RedirectResponse(307)
- Drop the EmailService.send_beta_signup_notification call (the user is
  now redirected into the register flow, which has its own email path)
- Add tests/test_beta_signup_redirect.py covering the 307 + Location

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/pages/LandingPage.tsx

@@ -1,11 +1,9 @@
-import { useState, useEffect, useCallback, useRef } from 'react'
+import { useState, useEffect, useRef } from 'react'
 import { Link } from 'react-router-dom'
 import { PageMeta } from '@/components/common/PageMeta'
 import { useAppConfig } from '@/hooks/useAppConfig'
 import '@/styles/landing.css'
 
-const API_URL = import.meta.env.VITE_API_URL || 'http://localhost:8000'
-
 const FAQ_ITEMS = [
   {
     q: 'How is this different from just using ChatGPT?',
@@ -33,9 +31,6 @@ export default function LandingPage() {
   const appConfig = useAppConfig()
   const [navScrolled, setNavScrolled] = useState(false)
   const [mobileMenuOpen, setMobileMenuOpen] = useState(false)
-  const [betaEmail, setBetaEmail] = useState('')
-  const [betaStatus, setBetaStatus] = useState<'idle' | 'sending' | 'sent' | 'error'>('idle')
-  const [betaError, setBetaError] = useState('')
   const [openFaq, setOpenFaq] = useState<number | null>(null)
   const mobileMenuRef = useRef<HTMLDivElement>(null)
 
@@ -73,32 +68,6 @@ export default function LandingPage() {
     return () => observer.disconnect()
   }, [])
 
-  const handleBetaSubmit = useCallback(async (e: React.FormEvent) => {
-    e.preventDefault()
-    const trimmed = betaEmail.trim()
-    if (!trimmed || betaStatus === 'sending') return
-    if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(trimmed)) {
-      setBetaStatus('error')
-      setBetaError('Enter a valid email address.')
-      return
-    }
-    setBetaStatus('sending')
-    setBetaError('')
-    try {
-      const resp = await fetch(`${API_URL}/api/v1/beta-signup`, {
-        method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ email: trimmed }),
-      })
-      if (!resp.ok) throw new Error('Signup failed')
-      setBetaStatus('sent')
-      setBetaEmail('')
-    } catch {
-      setBetaStatus('error')
-      setBetaError('Could not complete signup. Please try again or email hello@resolutionflow.com.')
-    }
-  }, [betaEmail, betaStatus])
-
   const toggleFaq = (index: number) => {
     setOpenFaq(prev => prev === index ? null : index)
   }
@@ -433,34 +402,10 @@ export default function LandingPage() {
           <section className="landing-cta-section landing-reveal">
             <div className="landing-cta-inner">
               <h2>Ready to stop writing ticket notes?</h2>
-              <p>Join the beta. Troubleshoot your next ticket with FlowPilot.</p>
-              <form className="landing-cta-email-form" onSubmit={handleBetaSubmit} noValidate>
-                <div className="landing-cta-input-wrap">
-                  <input
-                    type="email"
-                    className="landing-cta-email-input"
-                    placeholder="you@yourmsp.com"
-                    value={betaEmail}
-                    onChange={e => {
-                      setBetaEmail(e.target.value)
-                      if (betaStatus === 'error') { setBetaStatus('idle'); setBetaError('') }
-                    }}
-                    required
-                    aria-describedby="beta-status"
-                  />
-                  <button type="submit" className="landing-btn-hero-primary" disabled={betaStatus === 'sending'}>
-                    {betaStatus === 'sending' ? 'Joining\u2026' : betaStatus === 'sent' ? 'Joined!' : 'Join Beta'}
-                  </button>
-                </div>
-                <div id="beta-status" aria-live="polite" className="landing-cta-status">
-                  {betaStatus === 'sent' && (
-                    <p className="landing-cta-success">You&apos;re in. We&apos;ll send beta access details soon.</p>
-                  )}
-                  {betaStatus === 'error' && betaError && (
-                    <p className="landing-cta-error">{betaError}</p>
-                  )}
-                </div>
-              </form>
+              <p>Get early access. Troubleshoot your next ticket with FlowPilot.</p>
+              <div className="landing-cta-actions">
+                <Link to="/register?from=beta" className="landing-btn-hero-primary">Get started</Link>
+              </div>
               <p className="landing-cta-fine-print">Free to start. No credit card required.</p>
             </div>
           </section>