feat: Portal, Email Inbound, Discuss + module improvements

- Portal: /my/* routes, signup, password reset, portal user support
- Email Inbound: IMAP polling (go-imap/v2), thread matching
- Discuss: mail.channel, long-polling bus, DM, unread count
- Cron: ir.cron runner (goroutine scheduler)
- Bank Import, CSV/Excel Import
- Automation (ir.actions.server)
- Fetchmail service
- HR Payroll model
- Various fixes across account, sale, stock, purchase, crm, hr, project

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

addons/account/models/account_edi.go

@@ -315,7 +315,7 @@ func generateInvoiceXML(env *orm.Environment, moveID int64, formatCode string) (
 		IssueDate:            issueDateStr,
 		DueDate:              dueDateStr,
 		InvoiceTypeCode:      typeCode,
-		DocumentCurrencyCode: "EUR",
+		DocumentCurrencyCode: getCurrencyCode(env, moveID),
 		Supplier: UBLParty{
 			Name:    companyName,
 			Street:  ptrStr(companyStreet),
@@ -356,6 +356,19 @@ func generateInvoiceXML(env *orm.Environment, moveID int64, formatCode string) (
 	return b.String(), nil
 }
 
+// getCurrencyCode returns the ISO currency code for an invoice, defaulting to "EUR".
+func getCurrencyCode(env *orm.Environment, moveID int64) string {
+	var code string
+	env.Tx().QueryRow(env.Ctx(),
+		`SELECT COALESCE(c.name, 'EUR') FROM account_move m
+		 JOIN res_currency c ON c.id = m.currency_id
+		 WHERE m.id = $1`, moveID).Scan(&code)
+	if code == "" {
+		return "EUR"
+	}
+	return code
+}
+
 // ptrStr safely dereferences a *string, returning "" if nil.
 func ptrStr(s *string) string {
 	if s != nil {