Generalize USMT Dash and add a containerized demo mode

Remove all environment-specific data and make the dashboard adoptable
anywhere, then add a demo that runs the real PowerShell services.

- Strip cached device data, internal knowledge-base articles and
  screenshots, server/site names and the old project notes; replace the
  knowledge base with generic sample articles and diagrams
- Move every environment value into Config/usmt-dash.psd1
- Route all infrastructure access in the worker and Get-Software.ps1
  through a provider (Providers/SCCM.ps1), with a config-driven asset
  inventory view instead of a hard-coded custom class
- Add Providers/Demo.ps1: a deterministic simulated fleet whose
  migrations progress in real time, and Demo/New-DemoData.ps1 to seed it
- Server: -Demo makes the API read-only; add get-config and get-logs;
  serve static files only from web/, Documentation/ and an allowlist of
  Data/ files with a path-traversal guard; gzip large responses
- Mirror both services' console output to Data/Logs via a Write-Host
  proxy, and add a terminal panel to the dashboard that streams it
- Demo sandbox (web/demo/demo.js): visitor changes to tags, articles and
  images are kept in the visitor's browser and echoed in the terminals;
  nothing a visitor does reaches the server
- Vendor marked, highlight.js and html2pdf.js instead of loading CDNs
- Dockerfile and compose file for hosting the demo (Coolify-ready)

Documentation/Adobe Acrobat Pro.md

@@ -0,0 +1,26 @@
+[[Blue:Licensed]] [[Gray:Named User]]
+
+# Adobe Acrobat Pro
+
+Acrobat Pro is licensed per user through the Adobe Admin Console. The installer is the same unified package as Acrobat Reader; signing in with a licensed account unlocks Pro features.
+
+## Install
+
+1. Confirm the user is assigned an Acrobat Pro license in the Adobe Admin Console (ask the license owner if not).
+2. On the new device open **Software Center** and install **Adobe Acrobat (64-bit)**.
+   - Manual installer if Software Center is unavailable: [[Copy:\\fileserver\software\AcrobatPro\Setup.exe]]
+3. Launch Acrobat and have the user sign in with their company account.
+4. Verify **Help > About Adobe Acrobat** shows *Acrobat Pro*.
+
+## Common Issues
+
+**Still shows "Acrobat Reader" after sign-in**
+1. Sign out (**Help > Sign Out**), close Acrobat, sign back in.
+2. If it persists, the license assignment hasn't synced yet. Wait 15 minutes and repeat.
+
+**Default PDF handler reverted to Edge**
+- Settings > Apps > Default apps > search `.pdf` > choose **Adobe Acrobat**.
+
+## Migration Notes
+- USMT carries over Acrobat preferences, but **digital signature certificates** stored outside the user profile must be re-imported.
+- Custom stamps live in `%AppData%\Adobe\Acrobat\DC\Stamps`. Confirm they came across.