feat(company): add E-Taxes reference sections to Tax Policy tab

Adds six new collapsible sections at the very end of the Tax Policy
tab on Company form, each with an HTML field for a reference-data
table rendered by invoice_az/client/company.js:
- E-Taxes Objects
- Cash Registers
- POS Terminals
- Bank Accounts
- Obligation Pacts
- Presented Certificates

Tax Closing Wizards moved to the bottom (insert_after changed from
accounting_method to presented_certificates_list_html) so wizards
sit under the new sections.

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

jey_erp/custom_fields.py

@@ -1602,12 +1602,95 @@ def create_custom_fields():
                 description='Kassa metodu — gəlir və xərclər yalnız ödəniş zamanı tanınır. ƏDV öhdəliyi yalnız ödəniş alındıqda yaranır.\nHesablama metodu — gəlir və xərclər faktura zamanı tanınır.'
             ),
 
+            # === E-TAXES REFERENCE DATA (invoice_az) ===
+            # Anchored at the very end of the Tax Policy tab so these sections
+            # (and Tax Closing Wizards below them) appear after all other Tax
+            # Policy content instead of splitting tax_information_section.
+            dict(
+                fieldname='objects_list_section',
+                label='E-Taxes Objects',
+                fieldtype='Section Break',
+                insert_after='işsizlikdənsığortaüzrə',
+                collapsible=1,
+            ),
+            dict(
+                fieldname='objects_list_html',
+                fieldtype='HTML',
+                options='<div id="objects-list-container" class="etaxes-ref-list">Loading...</div>',
+                insert_after='objects_list_section',
+            ),
+            dict(
+                fieldname='cash_registers_list_section',
+                label='Cash Registers',
+                fieldtype='Section Break',
+                insert_after='objects_list_html',
+                collapsible=1,
+            ),
+            dict(
+                fieldname='cash_registers_list_html',
+                fieldtype='HTML',
+                options='<div id="cash-registers-list-container" class="etaxes-ref-list">Loading...</div>',
+                insert_after='cash_registers_list_section',
+            ),
+            dict(
+                fieldname='pos_terminals_list_section',
+                label='POS Terminals',
+                fieldtype='Section Break',
+                insert_after='cash_registers_list_html',
+                collapsible=1,
+            ),
+            dict(
+                fieldname='pos_terminals_list_html',
+                fieldtype='HTML',
+                options='<div id="pos-terminals-list-container" class="etaxes-ref-list">Loading...</div>',
+                insert_after='pos_terminals_list_section',
+            ),
+            dict(
+                fieldname='bank_accounts_list_section',
+                label='Bank Accounts',
+                fieldtype='Section Break',
+                insert_after='pos_terminals_list_html',
+                collapsible=1,
+            ),
+            dict(
+                fieldname='bank_accounts_list_html',
+                fieldtype='HTML',
+                options='<div id="bank-accounts-list-container" class="etaxes-ref-list">Loading...</div>',
+                insert_after='bank_accounts_list_section',
+            ),
+            dict(
+                fieldname='obligation_pacts_list_section',
+                label='Obligation Pacts',
+                fieldtype='Section Break',
+                insert_after='bank_accounts_list_html',
+                collapsible=1,
+            ),
+            dict(
+                fieldname='obligation_pacts_list_html',
+                fieldtype='HTML',
+                options='<div id="obligation-pacts-list-container" class="etaxes-ref-list">Loading...</div>',
+                insert_after='obligation_pacts_list_section',
+            ),
+            dict(
+                fieldname='presented_certificates_list_section',
+                label='Presented Certificates',
+                fieldtype='Section Break',
+                insert_after='obligation_pacts_list_html',
+                collapsible=1,
+            ),
+            dict(
+                fieldname='presented_certificates_list_html',
+                fieldtype='HTML',
+                options='<div id="presented-certificates-list-container" class="etaxes-ref-list">Loading...</div>',
+                insert_after='presented_certificates_list_section',
+            ),
+
             # === TAX CLOSING WIZARDS ===
             dict(
                 fieldname='tax_wizards_section',
                 label='Tax Closing Wizards',
                 fieldtype='Section Break',
-                insert_after='accounting_method'
+                insert_after='presented_certificates_list_html',
             ),
             dict(
                 fieldname='tax_wizards_html',