feat: unify install.sh — single installer for framework + npm CLI

- tools/install.sh now installs both components:
  1. Framework (bash launcher, guides, runtime configs) → ~/.config/mosaic/
  2. @mosaic/cli (TUI, gateway client, wizard) → ~/.npm-global/
- Downloads framework from monorepo archive (no bootstrap repo dependency)
- Supports --framework, --cli, --check, --ref flags
- Delete remote-install.sh and remote-install.ps1 (redundant redirectors)
- Update all stale mosaic/bootstrap references → mosaic/mosaic-stack
- Update README.md with monorepo install instructions

Deprecates: mosaic/bootstrap repo

packages/mosaic/framework/bin/mosaic-release-upgrade.ps1

@@ -19,7 +19,7 @@ $MosaicHome = if ($env:MOSAIC_HOME) { $env:MOSAIC_HOME } else { Join-Path $env:U
 $RemoteInstallerUrl = if ($env:MOSAIC_REMOTE_INSTALL_URL) {
     $env:MOSAIC_REMOTE_INSTALL_URL
 } else {
-    "https://git.mosaicstack.dev/mosaic/bootstrap/raw/branch/main/remote-install.ps1"
+    "https://git.mosaicstack.dev/mosaic/mosaic-stack/raw/branch/main/tools/install.sh"
 }
 
 $installMode = if ($Overwrite) { "overwrite" } elseif ($Keep) { "keep" } elseif ($env:MOSAIC_INSTALL_MODE) { $env:MOSAIC_INSTALL_MODE } else { "keep" }