feat(billing): Stripe/Lago-verified go-forward sync + activate daily cron

The NexaCloud->Odoo ledger now verifies every new invoice against its
SOURCE billing system before posting, instead of trusting NexaCloud's
unreliable created_at/status/paid_at:

- _fc_verify routes by stripe_invoice_id prefix (in_ -> Stripe REST,
  lago: -> Lago REST) and returns source-truth
  {invoice_date, void, draft, paid, paid_at, amount_paid}, or None when it
  can't be determined/reached (left for the next run).
- _ingest_invoices(post=True, verified=...) uses the source invoice date
  (and accounting date), and reconciles a payment ONLY when the source
  confirms paid.
- _cron_sync_verified posts only finalized invoices; skips void + draft,
  logs unverified for retry. Replaces the old _cron_ingest_recent.

Cron cron_fc_invoice_ledger is enabled daily on nexamain. First live run:
23 already-posted, 1 void + 2 Stripe drafts + 5 zero-amount all skipped,
0 new posted, ledger intact at $3,403.46.

Tests: routing/guards (no network), verified date+reconcile, and the cron's
void/draft/unverified filtering (sources patched). FCB_EXIT=0 on odoo-trial.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_centralize_billing/__manifest__.py

@@ -3,7 +3,7 @@
 # License OPL-1 (Odoo Proprietary License v1.0)
 {
     "name": "Fusion Centralized Billing",
-    "version": "19.0.1.0.0",
+    "version": "19.0.1.1.0",
     "category": "Accounting/Subscriptions",
     "summary": "Centralized billing engine for all NexaSystems services — metered usage, "
                "per-app billing API, and outbound webhooks on top of Odoo Enterprise subscriptions.",