Support a remote ComfyUI via a .env config file

- run.sh / run.ps1: load an optional .env for host-specific env vars
- .env.example + docs: ComfyUI can run on another host (ROUTER_COMFYUI)
- .gitignore: .env

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

run.ps1

@@ -3,6 +3,14 @@
 $ErrorActionPreference = "Stop"
 Set-Location $PSScriptRoot
 
+# optional local config (host-specific env vars, kept out of git — see .env.example)
+if (Test-Path ".env") {
+    Get-Content ".env" | Where-Object { $_ -match '^\s*[^#=]+=' } | ForEach-Object {
+        $k, $v = $_ -split '=', 2
+        [Environment]::SetEnvironmentVariable($k.Trim(), $v.Trim(), 'Process')
+    }
+}
+
 # load keys from files into env (kept out of git)
 if (Test-Path ".apikey")         { $env:ROUTER_API_KEY        = (Get-Content ".apikey" -Raw).Trim() }
 if (Test-Path ".uncensored_key") { $env:ROUTER_UNCENSORED_KEY = (Get-Content ".uncensored_key" -Raw).Trim() }