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/mail/models/init.go

@@ -0,0 +1,16 @@
+// Package models registers all mail module models.
+package models
+
+// Init registers all models for the mail module.
+// Called by the module loader in dependency order.
+func Init() {
+	initMailMessage()      // mail.message
+	initMailFollowers()    // mail.followers
+	initMailActivityType() // mail.activity.type
+	initMailActivity()     // mail.activity
+	initMailChannel()      // mail.channel + mail.channel.member
+	// Extensions (must come after base models are registered)
+	initMailThread()
+	initMailChannelExtensions()
+	initDiscussBus()
+}