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/actions/seed-demo.ts

@@ -13,14 +13,13 @@ import {
   expenses,
   profiles,
 } from "@/lib/db/schema"
-import { getSessionUser } from "@/lib/session"
+import { getSessionUser, isAdminUser } from "@/lib/session"
 import { redirect } from "next/navigation"
 
 export async function seedDemoData() {
-  if (process.env.NODE_ENV === "production") { throw new Error("Demo tools are disabled in production") }
-
   const user = await getSessionUser()
   if (!user) redirect("/login")
+  if (!isAdminUser(user)) throw new Error("Admin only")
 
   const uid = user.id
 
@@ -370,10 +369,9 @@ export async function seedDemoData() {
 }
 
 export async function setTestPlan(plan: "pro" | "landlord" | "lifetime" | "starter") {
-  if (process.env.NODE_ENV === "production") { throw new Error("Demo tools are disabled in production") }
-
   const user = await getSessionUser()
   if (!user) redirect("/login")
+  if (!isAdminUser(user)) throw new Error("Admin only")
 
   await db.update(profiles).set({ plan }).where(eq(profiles.id, user.id))
 
@@ -381,10 +379,9 @@ export async function setTestPlan(plan: "pro" | "landlord" | "lifetime" | "start
 }
 
 export async function clearDemoData() {
-  if (process.env.NODE_ENV === "production") { throw new Error("Demo tools are disabled in production") }
-
   const user = await getSessionUser()
   if (!user) redirect("/login")
+  if (!isAdminUser(user)) throw new Error("Admin only")
 
   const uid = user.id