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_followup.go

@@ -2,6 +2,7 @@ package models
 
 import (
 	"fmt"
+	"html"
 	"strings"
 
 	"odoo-go/pkg/orm"
@@ -276,7 +277,7 @@ func initFollowupProcess() {
 			.overdue{color:#d9534f;font-weight:bold}
 			h2{color:#875a7b}
 		</style>`)
-		b.WriteString(fmt.Sprintf("<h2>Payment Follow-up: %s</h2>", partnerName))
+		b.WriteString(fmt.Sprintf("<h2>Payment Follow-up: %s</h2>", html.EscapeString(partnerName)))
 		b.WriteString(`<table><tr><th>Invoice</th><th>Due Date</th><th>Total</th><th>Amount Due</th><th>Overdue Days</th></tr>`)
 
 		var totalDue float64