Add publish scripts, Gitea Actions workflow, and pre-built binary downloads to README

scripts/publish-all.ps1

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+param(
+    [string]$Version = "1.0.0"
+)
+
+$Project = "ADBulkTool.csproj"
+$Config = "Release"
+
+function Publish {
+    param([string]$Rid, [string]$Suffix)
+
+    Write-Host "Publishing for $Rid..."
+    dotnet publish $Project `
+        -c $Config `
+        -r $Rid `
+        --self-contained true `
+        -p:PublishSingleFile=true `
+        -p:IncludeNativeLibrariesForSelfExtract=true `
+        -p:Version=$Version `
+        -o "publish/$Suffix"
+
+    Write-Host "  -> publish/$Suffix"
+}
+
+Push-Location (Split-Path $PSScriptRoot)
+
+Publish "win-x64"   "windows-x64"
+Publish "linux-x64" "linux-x64"
+Publish "osx-x64"   "macos-x64"
+Publish "osx-arm64" "macos-arm64"
+
+Write-Host ""
+Write-Host "All builds complete. Artifacts are in ./publish/"
+Get-ChildItem ./publish/*/ | Select-Object Name, Length
+
+Pop-Location

scripts/publish-all.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+PROJECT="ADBulkTool.csproj"
+CONFIG="Release"
+VERSION="${1:-1.0.0}"
+
+publish() {
+    local rid="$1"
+    local suffix="$2"
+    echo "Publishing for $rid..."
+    dotnet publish "$PROJECT" \
+        -c "$CONFIG" \
+        -r "$rid" \
+        --self-contained true \
+        -p:PublishSingleFile=true \
+        -p:IncludeNativeLibrariesForSelfExtract=true \
+        -p:Version="$VERSION" \
+        -o "publish/$suffix"
+    echo "  -> publish/$suffix"
+}
+
+publish "win-x64"   "windows-x64"
+publish "linux-x64" "linux-x64"
+publish "osx-x64"   "macos-x64"
+publish "osx-arm64" "macos-arm64"
+
+echo ""
+echo "All builds complete. Artifacts are in ./publish/"
+ls -lh publish/*/