blancco: CMMC evidence pack, ServiceNow tick list, cloud-upload status

Automates the Blancco parts of the onsite-support CMMC playbook:

- ENT-056/158 evidence pack: /reports/evidence?month=YYYY-MM returns
  ENT-056_<Site>_<YYYY-MM>.zip (summary.csv, README, each report's XML
  and PDF). pxe-blancco-evidence.timer saves last month's pack to the
  reports share's evidence/ folder on the 1st (Persistent).
- ENT-045/159 ServiceNow tick list: /reports/servicenow lists recent
  reports as "Wiped" or "Blancco Wipe failed" with a pre-written
  destruction note, copy buttons and Done (CSRF-protected).
- Cloud upload: blancco-progress.py posts each report's upload result
  ("Sending report document id" -> "Report sent to MC") to
  /reports/cloud-status (CSRF-exempt like /imaging/status); the Reports
  page and the CSVs show it, so a wipe missing from BMP is visible.
- CSV gains failure_reason (exception messages, failed steps, error
  counts), business_location and cloud_upload.
- Preferences: business_location "West Jefferson" (config.BLANCCO_SITE)
  and pdf+xml reports; the report copier now copies the PDF too, named
  after its XML. .part and hidden files are not listed as reports.

State (cloud confirmations, ServiceNow ticks) is a JSON file at
/var/lib/pxe-webapp/blancco-state.json, off the report share.

playbook/blancco-preferences.xml

@@ -252,7 +252,7 @@
       <creation_date>2026-06-22</creation_date>
     </image>
     <customer_data>
-      <business_location></business_location>
+      <business_location>West Jefferson</business_location>
       <customer_license>GE Aerospace</customer_license>
       <erasure_person></erasure_person>
       <erasure_provider></erasure_provider>
@@ -312,8 +312,8 @@
       <per_drive>false</per_drive>
       <auto_backup>true</auto_backup>
       <extensions type="array" key="extension">
-        <extension selected="true">xml</extension>
-        <extension>pdf+xml</extension>
+        <extension>xml</extension>
+        <extension selected="true">pdf+xml</extension>
       </extensions>
       <utc_offset>0</utc_offset>
       <network_info>true</network_info>