ruvds-backup: add email-notify (Yandex SMTP 587 STARTTLS) + fix size calc

Add dual-channel notifications — ntfy (already there) + email via
Send-MailMessage / Yandex SMTP, mirroring VDS msmtp pipeline.

Email: noreply@snolla.com -> vitya.kuznetsov@gmail.com.
Verified delivered (DKIM pass, SPF pass) via run #2 + manual smoke.

Settings sourced from C:\sites\snolla\Web.config <mailSettings> (Yandex
SMTP), cross-checked against pass-store snolla-smtp/full-env. Same
creds, same account as VDS backup msmtp uses.

SMTP port: 587 STARTTLS, NOT 465 implicit-TLS:
.NET SmtpClient / Send-MailMessage support only STARTTLS. Yandex
accepts both; we use 587 for native PS tooling. VDS msmtp uses 465
implicit-TLS — both work, different tools.

Size in email: switched from `rclone size --json | ConvertFrom-Json`
(parses fail when rclone NOTICE stderr leaks into stdout) to local
Get-ChildItem on C:\sites\snolla. Instant, no JSON dance.

setup.ps1: ned params for SMTP creds + OPS_NOTIFY_EMAIL; config.env
template extended.

README.md: notifications section split into ntfy + email subsections,
new SMTP-port + size-calc decisions in Decisions log.

Run #2 (12:30:03) and run #3 (12:33) both produced email delivery
receipts in user inbox.

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

scripts/ruvds-backup-daily-kreknin/setup.ps1

@@ -24,6 +24,12 @@ param(
     [string]$NtfyPass = 'Pryakhin9',
     [string]$NtfyUrl = 'https://ntfy.vds.kzntsv.site',
     [string]$NtfyTopic = 'vds-backup',
+    [string]$SmtpHost = 'smtp.yandex.ru',
+    [int]$SmtpPort = 587,
+    [string]$SmtpFrom = 'noreply@snolla.com',
+    [string]$SmtpUser = 'noreply@snolla.com',
+    [string]$SmtpPass = 'JP44ajqZ3K#W',
+    [string]$OpsNotifyEmail = 'vitya.kuznetsov@gmail.com',
     [string]$ScheduleAt = '04:30'
 )
 $ErrorActionPreference = 'Stop'
@@ -71,12 +77,18 @@ disable_hashcheck = true
 & cmd.exe /c "icacls `"$base\rclone.conf`" /inheritance:r /grant `"SYSTEM:(F)`" /grant `"BUILTIN\Administrators:(F)`"" | Out-Null
 Write-Host "[OK] rclone.conf written"
 
-# 4. config.env
+# 4. config.env (ntfy + SMTP creds)
 @"
 NTFY_URL=$NtfyUrl
 NTFY_TOPIC=$NtfyTopic
 NTFY_USER=$NtfyUser
 NTFY_PASS=$NtfyPass
+SMTP_HOST=$SmtpHost
+SMTP_PORT=$SmtpPort
+SMTP_FROM=$SmtpFrom
+SMTP_USER=$SmtpUser
+SMTP_PASS=$SmtpPass
+OPS_NOTIFY_EMAIL=$OpsNotifyEmail
 "@ | Set-Content "$base\config.env" -Encoding ASCII -Force
 & cmd.exe /c "icacls `"$base\config.env`" /inheritance:r /grant `"SYSTEM:(F)`" /grant `"BUILTIN\Administrators:(F)`"" | Out-Null
 Write-Host "[OK] config.env written"