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/ai/maintenance-summary/route.ts

@@ -3,6 +3,7 @@ import { and, eq } from "drizzle-orm"
 import { db } from "@/lib/db"
 import { properties, maintenance_requests } from "@/lib/db/schema"
 import { getSessionUser } from "@/lib/session"
+import { getEffectiveOwnerId } from "@/lib/account"
 import { openai } from "@/lib/ai/client"
 import { MAINTENANCE_SUMMARY_PROMPT, dataBlock } from "@/lib/ai/prompts"
 import { enforceAiQuota } from "@/lib/ai/usage"
@@ -14,6 +15,8 @@ export async function POST(request: Request) {
   const quota = await enforceAiQuota(user.id, "ai_maintenance_summary")
   if (!quota.ok) return NextResponse.json({ error: quota.error }, { status: quota.status })
 
+  const ownerId = await getEffectiveOwnerId(user.id)
+
   const { property_id } = await request.json() as { property_id: string }
 
   const requests = await db
@@ -29,10 +32,10 @@ export async function POST(request: Request) {
       resolved_at: maintenance_requests.resolved_at,
     })
     .from(maintenance_requests)
-    .where(and(eq(maintenance_requests.user_id, user.id), eq(maintenance_requests.property_id, property_id)))
+    .where(and(eq(maintenance_requests.user_id, ownerId), eq(maintenance_requests.property_id, property_id)))
 
   const property = await db.query.properties.findFirst({
-    where: and(eq(properties.id, property_id), eq(properties.user_id, user.id)),
+    where: and(eq(properties.id, property_id), eq(properties.user_id, ownerId)),
     columns: { name: true },
   })