feat: add bootstrap scripts for one-line installer download

get-cameleer.sh and get-cameleer.ps1 download just the installer
files from Gitea into a local ./installer directory. Usage:

  curl -fsSL https://gitea.siegeln.net/.../get-cameleer.sh | bash
  irm https://gitea.siegeln.net/.../get-cameleer.ps1 | iex

Supports --version=v1.2.0 to pin a specific tag, defaults to main.
Pass --run to auto-execute the installer after download.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

get-cameleer.ps1

@@ -0,0 +1,64 @@
+#Requires -Version 5.1
+<#
+.SYNOPSIS
+  Bootstrap script — downloads the Cameleer installer and runs it.
+.EXAMPLE
+  irm https://gitea.siegeln.net/cameleer/cameleer-saas/raw/branch/main/get-cameleer.ps1 | iex
+  .\get-cameleer.ps1 -Version v1.2.0
+#>
+param(
+    [string]$Version,
+    [string]$Ref,
+    [switch]$Run
+)
+
+$ErrorActionPreference = 'Stop'
+
+$Repo = 'https://gitea.siegeln.net/cameleer/cameleer-saas/raw'
+if ($Version) { $RefPath = "tag/$Version" }
+elseif ($Ref) { $RefPath = "branch/$Ref" }
+else          { $RefPath = 'branch/main' }
+
+$Base = "$Repo/$RefPath"
+$Dir  = '.\installer'
+
+$Files = @(
+    'installer/install.sh'
+    'installer/install.ps1'
+    'installer/templates/docker-compose.yml'
+    'installer/templates/docker-compose.saas.yml'
+    'installer/templates/docker-compose.server.yml'
+    'installer/templates/docker-compose.tls.yml'
+    'installer/templates/docker-compose.monitoring.yml'
+    'installer/templates/traefik-dynamic.yml'
+    'installer/templates/.env.example'
+)
+
+Write-Host 'Downloading Cameleer installer...'
+
+New-Item -ItemType Directory -Path "$Dir\templates" -Force | Out-Null
+
+foreach ($file in $Files) {
+    $localPath = Join-Path $Dir ($file -replace '^installer/', '')
+    $localDir  = Split-Path $localPath -Parent
+    if (-not (Test-Path $localDir)) { New-Item -ItemType Directory -Path $localDir -Force | Out-Null }
+
+    Write-Host "  $($file -replace '^installer/', '')"
+    try {
+        Invoke-WebRequest -Uri "$Base/$file" -OutFile $localPath -UseBasicParsing
+    } catch {
+        # install.ps1 may not exist yet — skip gracefully
+        if ($file -match 'install\.ps1$') { continue }
+        throw
+    }
+}
+
+Write-Host ''
+Write-Host "Installer ready in $Dir\"
+Write-Host 'Run:  cd installer; .\install.ps1'
+Write-Host ''
+
+if ($Run) {
+    Set-Location $Dir
+    & .\install.ps1 @args
+}