Deploy on DigitalOcean App Platform (GitHub-source build) + consolidate audit-fixes

Deploy config:
- .do/app.yaml: build the Dockerfile directly from GitHub (deploy_on_push) instead
  of a pre-built DOCR image; NEXT_PUBLIC_* set RUN_AND_BUILD_TIME with the
  propertymanagement.network domain so they bake into the client bundle; add
  custom domains block (apex + www); wire Sentry DSN (server + browser).

Included pending work from the audit-fixes branch:
- AI provider abstraction (OpenAI/Anthropic, admin-selectable; Anthropic default)
- Per-landlord e-signature (DocuSign OAuth + Dropbox Sign) + migration 0010
- Outbound webhooks / Zapier integration
- PayPal removal (Stripe-only billing)
- Storage hardening (fail-loud when Spaces unconfigured), security fixes

Verified: full production Docker build (same build-args as DO) passes clean.

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

components/forms/checkout-button.tsx

@@ -9,7 +9,6 @@ export function CheckoutButton({
   highlight,
   interval = "month",
   annualAvailable = false,
-  paypalEnabled = false,
 }: {
   plan: string
   label: string
@@ -18,11 +17,8 @@ export function CheckoutButton({
   // When true, show a monthly/annual choice. Only pass this for subscription
   // plans and only when annual billing is actually configured server-side.
   annualAvailable?: boolean
-  // When true, also offer "Pay with PayPal" using the same interval choice.
-  paypalEnabled?: boolean
 }) {
   const [loading, setLoading] = useState(false)
-  const [paypalLoading, setPaypalLoading] = useState(false)
   const [chosenInterval, setChosenInterval] = useState<"month" | "year">(interval)
 
   const effectiveInterval = annualAvailable ? chosenInterval : interval
@@ -39,21 +35,6 @@ export function CheckoutButton({
     else setLoading(false)
   }
 
-  async function handlePaypal() {
-    setPaypalLoading(true)
-    const res = await fetch("/api/paypal/checkout", {
-      method: "POST",
-      headers: { "Content-Type": "application/json" },
-      body: JSON.stringify({ plan, interval: effectiveInterval }),
-    })
-    const data = await res.json()
-    if (data.url) window.location.href = data.url
-    else {
-      setPaypalLoading(false)
-      if (data.error) alert(data.error)
-    }
-  }
-
   return (
     <div className="space-y-2">
       {annualAvailable && (
@@ -82,7 +63,7 @@ export function CheckoutButton({
       )}
       <button
         onClick={handleClick}
-        disabled={loading || paypalLoading}
+        disabled={loading}
         className={cn(
           "w-full rounded-lg py-2 text-xs font-semibold transition disabled:opacity-50",
           highlight
@@ -92,22 +73,6 @@ export function CheckoutButton({
       >
         {loading ? "Loading..." : label}
       </button>
-
-      {paypalEnabled && (
-        <button
-          onClick={handlePaypal}
-          disabled={loading || paypalLoading}
-          className="flex w-full items-center justify-center gap-1.5 rounded-lg bg-[#ffc439] py-2 text-xs font-bold text-[#003087] transition hover:bg-[#f0b90b] disabled:opacity-50"
-        >
-          {paypalLoading ? (
-            "Loading..."
-          ) : (
-            <>
-              Pay with <span className="font-extrabold italic">Pay<span className="text-[#009cde]">Pal</span></span>
-            </>
-          )}
-        </button>
-      )}
     </div>
   )
 }