chore: sync in-progress work across marketing, admin, API and tests

Snapshot of uncommitted work that had accumulated in the tree alongside
the Turnstile changes:

- marketing pages, SEO helpers (lib/seo.ts, lib/marketing/) and
  structured data
- admin billing actions and a per-user portfolio view, plus an admin
  error boundary
- rate limiting (lib/rate-limit.ts) applied across the /api/v1 surface
- CSP and proxy adjustments, accounting/webhook lib updates
- Playwright config and an e2e/unit test suite
- next bumped to ^16.3.4 with the lockfile regenerated
- generated AGENTS.md / CLAUDE.md

Authored by other sessions working in this tree; committed here so the
Turnstile work could be pushed without leaving the tree dirty.
Typecheck passes.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/api/v1/properties/route.ts

@@ -4,6 +4,8 @@ import { db } from "@/lib/db"
 import { properties } from "@/lib/db/schema"
 import { propertySchema } from "@/lib/validations"
 import { resolveApiRequest } from "@/lib/api-auth"
+import { enforceRateLimit } from "@/lib/rate-limit"
+import { checkPropertyLimit } from "@/lib/plan-limits"
 import { emitWebhookEvent } from "@/lib/webhooks/emit"
 import { geocodeAddress } from "@/lib/geocoding"
 
@@ -19,6 +21,10 @@ export async function GET(request: Request) {
   const ctx = await resolveApiRequest(request)
   if (!ctx) return unauthorized()
 
+  // Public API budget: 120 requests/minute per key owner.
+  const limited = enforceRateLimit(`v1:${ctx.userId}`, 120, 60)
+  if (limited) return limited
+
   const data = await db.query.properties.findMany({
     where: eq(properties.user_id, ctx.ownerId),
     with: { units: { columns: { id: true, status: true } } },
@@ -31,6 +37,10 @@ export async function GET(request: Request) {
 export async function POST(request: Request) {
   const ctx = await resolveApiRequest(request)
   if (!ctx) return unauthorized()
+
+  // Public API budget: 120 requests/minute per key owner.
+  const limited = enforceRateLimit(`v1:${ctx.userId}`, 120, 60)
+  if (limited) return limited
   if (!ctx.canWrite) return forbidden()
 
   const body = await request.json().catch(() => null)
@@ -42,6 +52,14 @@ export async function POST(request: Request) {
     )
   }
 
+  // Same plan cap the session route enforces — the public API is a creation
+  // entry point too, and skipping this here let a Starter key create unlimited
+  // properties.
+  const limitError = await checkPropertyLimit(ctx.ownerId)
+  if (limitError) {
+    return NextResponse.json({ error: { code: 403, message: limitError } }, { status: 403 })
+  }
+
   const coords = await geocodeAddress(parsed.data)
 
   const [data] = await db