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/stock/models/stock_landed_cost.go

@@ -2,7 +2,6 @@ package models
 
 import (
 	"fmt"
-	"math"
 
 	"odoo-go/pkg/orm"
 )
@@ -221,8 +220,11 @@ func initStockLandedCost() {
 				_, err := env.Tx().Exec(env.Ctx(),
 					`UPDATE stock_valuation_layer
 					 SET remaining_value = remaining_value + $1, value = value + $1
-					 WHERE stock_move_id = $2 AND product_id = $3 AND remaining_qty > 0
-					 LIMIT 1`,
+					 WHERE id = (
+						SELECT id FROM stock_valuation_layer
+						WHERE stock_move_id = $2 AND product_id = $3 AND remaining_qty > 0
+						ORDER BY id LIMIT 1
+					 )`,
 					adj.AdditionalCost, adj.MoveID, adj.ProductID,
 				)
 				if err != nil {
@@ -375,8 +377,3 @@ func initStockLandedCost() {
 		orm.Many2one("currency_id", "res.currency", orm.FieldOpts{String: "Currency"}),
 	)
 }
-
-// roundCurrency rounds a monetary value to 2 decimal places.
-func roundCurrency(value float64) float64 {
-	return math.Round(value*100) / 100
-}