Consolidate audit-fixes branch: webhooks, integrations, and deploy hardening

Batch commit of the pending working tree on security/audit-fixes-2026-07.
Major areas:
- Outbound webhooks / Zapier: schema + signed delivery with retries, public
  v1 API (REST-hook subscribe/unsubscribe), settings UI, cron drain.
- Deploy hardening: email via SMTP2GO (Resend fully removed), verified DB TLS
  (DATABASE_SSL=require + DATABASE_CA), storage fails loud in production when
  Spaces is unconfigured instead of silently using ephemeral disk.
- Integrations & features (concurrent work): accounting (QuickBooks/Xero),
  e-signature (DocuSign/Dropbox Sign), PayPal, geocoding/maps, onboarding,
  expanded legal pages.
- DB migrations 0006–0009.

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

app/api/rent/[id]/route.ts

@@ -6,20 +6,26 @@ import { getSessionUser } from "@/lib/session"
 import { rentPaymentSchema } from "@/lib/validations"
 import { ownsProperty, ownsUnit, ownsTenant } from "@/lib/db/ownership"
 import { logActivity } from "@/lib/activity"
+import { getAccountContext } from "@/lib/account"
+import { emitWebhookEvent } from "@/lib/webhooks/emit"
 
 export async function PATCH(request: Request, { params }: { params: Promise<{ id: string }> }) {
   const user = await getSessionUser()
   if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
 
+  const ctx = await getAccountContext(user.id)
+  const ownerId = ctx.ownerId
+  if (!ctx.canWrite) return NextResponse.json({ error: "Forbidden" }, { status: 403 })
+
   const { id } = await params
   const body = await request.json()
   const parsed = rentPaymentSchema.partial().safeParse(body)
   if (!parsed.success) return NextResponse.json({ error: parsed.error.flatten() }, { status: 400 })
 
   if (
-    !(await ownsProperty(user.id, parsed.data.property_id)) ||
-    !(await ownsUnit(user.id, parsed.data.unit_id)) ||
-    !(await ownsTenant(user.id, parsed.data.tenant_id))
+    !(await ownsProperty(ownerId, parsed.data.property_id)) ||
+    !(await ownsUnit(ownerId, parsed.data.unit_id)) ||
+    !(await ownsTenant(ownerId, parsed.data.tenant_id))
   ) {
     return NextResponse.json({ error: "Invalid reference" }, { status: 403 })
   }
@@ -33,17 +39,18 @@ export async function PATCH(request: Request, { params }: { params: Promise<{ id
   const [data] = await db
     .update(rent_payments)
     .set(updateData)
-    .where(and(eq(rent_payments.id, id), eq(rent_payments.user_id, user.id)))
+    .where(and(eq(rent_payments.id, id), eq(rent_payments.user_id, ownerId)))
     .returning()
 
   if (parsed.data.status === "paid") {
     await logActivity({
-      userId: user.id,
+      userId: ownerId,
       type: "rent_paid",
       title: "Rent payment marked as paid",
       entityType: "rent_payment",
       entityId: id,
     })
+    await emitWebhookEvent({ ownerId, event: "payment.paid", data: { payment: data } })
   }
 
   return NextResponse.json(data)
@@ -53,7 +60,11 @@ export async function DELETE(_: Request, { params }: { params: Promise<{ id: str
   const user = await getSessionUser()
   if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
 
+  const ctx = await getAccountContext(user.id)
+  const ownerId = ctx.ownerId
+  if (!ctx.canWrite) return NextResponse.json({ error: "Forbidden" }, { status: 403 })
+
   const { id } = await params
-  await db.delete(rent_payments).where(and(eq(rent_payments.id, id), eq(rent_payments.user_id, user.id)))
+  await db.delete(rent_payments).where(and(eq(rent_payments.id, id), eq(rent_payments.user_id, ownerId)))
   return NextResponse.json({ success: true })
 }