feat(db-load-xml, db-load-git): add -UpdateDB flag to combine load + update in one Designer run

Closes #8 — adds /UpdateDBCfg parameter support so users can load config
and update database in a single 1C Designer invocation instead of two.

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

.claude/skills/db-load-git/scripts/db-load-git.ps1

@@ -1,4 +1,4 @@
-# db-load-git v1.1 — Load Git changes into 1C database
+# db-load-git v1.2 — Load Git changes into 1C database
 # Source: https://github.com/Nikolay-Shirokov/cc-1c-skills
 <#
 .SYNOPSIS
@@ -98,7 +98,10 @@ param(
     [string]$Format = "Hierarchical",
 
     [Parameter(Mandatory=$false)]
-    [switch]$DryRun
+    [switch]$DryRun,
+
+    [Parameter(Mandatory=$false)]
+    [switch]$UpdateDB
 )
 
 $OutputEncoding = [System.Text.Encoding]::UTF8
@@ -314,6 +317,11 @@ try {
         $arguments += "-AllExtensions"
     }
 
+    # --- UpdateDB ---
+    if ($UpdateDB) {
+        $arguments += "/UpdateDBCfg"
+    }
+
     # --- Output ---
     $outFile = Join-Path $tempDir "load_log.txt"
     $arguments += "/Out", "`"$outFile`""