Account module massive expansion: 2499→5049 LOC (+2550)

New models (12):
- account.asset: depreciation (linear/degressive), journal entry generation
- account.edi.format + account.edi.document: UBL 2.1 XML e-invoicing
- account.followup.line: payment follow-up escalation levels
- account.reconcile.model + lines: automatic bank reconciliation rules
- crossovered.budget + lines + account.budget.post: budgeting system
- account.cash.rounding: invoice rounding (UP/DOWN/HALF-UP)
- account.payment.method + lines: payment method definitions
- account.invoice.send: invoice sending wizard

Enhanced existing:
- account.move: action_reverse (credit notes), access_url, invoice_has_outstanding
- account.move.line: tax_tag_ids, analytic_distribution, date_maturity, matching_number
- Entry hash chain integrity (SHA-256, secure_sequence_number)
- Report HTML rendering for all 6 report types
- res.partner extended with followup status + overdue tracking

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

addons/account/models/init.go

@@ -17,4 +17,15 @@ func Init() {
 	initAccountAnalytic()
 	initAccountRecurring()
 	initAccountCompanyExtension()
+	initAccountPaymentMethod()
+	initAccountAsset()
+	initAccountBudget()
+	initAccountCashRounding()
+	initAccountInvoiceSend()
+	initAccountCashRoundingOnMove()
+	initAccountFollowup()
+	initAccountLock()
+	initAccountSequence()
+	initAccountEdi()
+	initAccountReconcileModel()
 }