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/v1/maintenance/[id]/route.ts

@@ -0,0 +1,76 @@
+import { NextResponse } from "next/server"
+import { and, eq } from "drizzle-orm"
+import { z } from "zod"
+import { db } from "@/lib/db"
+import { maintenance_requests } from "@/lib/db/schema"
+import { maintenanceSchema } from "@/lib/validations"
+import { ownsProperty, ownsUnit, ownsTenant } from "@/lib/db/ownership"
+import { resolveApiRequest } from "@/lib/api-auth"
+import { emitWebhookEvent } from "@/lib/webhooks/emit"
+
+// Public REST API (v1) — update a single maintenance request. Bearer API-key
+// auth. Owner-scoped by id; mirrors the internal PATCH schema.
+
+const unauthorized = () =>
+  NextResponse.json({ error: { code: 401, message: "Unauthorized" } }, { status: 401 })
+const forbidden = () =>
+  NextResponse.json({ error: { code: 403, message: "Forbidden" } }, { status: 403 })
+
+const maintenancePatchSchema = maintenanceSchema.partial().extend({
+  status: z.enum(["open", "in_progress", "resolved", "closed"]).optional(),
+  resolution_notes: z.string().optional(),
+  actual_cost: z.number().positive().optional(),
+  resolved_at: z.string().optional(),
+})
+
+export async function PATCH(request: Request, { params }: { params: Promise<{ id: string }> }) {
+  const ctx = await resolveApiRequest(request)
+  if (!ctx) return unauthorized()
+  if (!ctx.canWrite) return forbidden()
+
+  const { id } = await params
+  const body = await request.json().catch(() => null)
+  const parsed = maintenancePatchSchema.safeParse(body)
+  if (!parsed.success) {
+    return NextResponse.json(
+      { error: { code: 400, message: parsed.error.flatten() } },
+      { status: 400 }
+    )
+  }
+
+  // If any FK is being changed, ensure the caller owns the referenced rows.
+  if (
+    !(await ownsProperty(ctx.ownerId, parsed.data.property_id)) ||
+    !(await ownsUnit(ctx.ownerId, parsed.data.unit_id)) ||
+    !(await ownsTenant(ctx.ownerId, parsed.data.tenant_id))
+  ) {
+    return forbidden()
+  }
+
+  const updateData: Record<string, unknown> = { ...parsed.data }
+
+  // Auto-stamp resolved_at when transitioning to resolved.
+  if (parsed.data.status === "resolved" && !parsed.data.resolved_at) {
+    updateData.resolved_at = new Date().toISOString()
+  }
+
+  const [data] = await db
+    .update(maintenance_requests)
+    .set(updateData)
+    .where(and(eq(maintenance_requests.id, id), eq(maintenance_requests.user_id, ctx.ownerId)))
+    .returning()
+
+  if (!data) {
+    return NextResponse.json({ error: { code: 404, message: "Not found" } }, { status: 404 })
+  }
+
+  if (parsed.data.status) {
+    await emitWebhookEvent({
+      ownerId: ctx.ownerId,
+      event: "maintenance.updated",
+      data: { maintenance: data },
+    })
+  }
+
+  return NextResponse.json({ data })
+}