provision: add ccrypt, nodejs, claude, ssh identity keys, fix scons obj dirs

- Install ccrypt, nodejs 18, npm, claude code in provision
- Decrypt id_rsa/id_rsa.pub via dongle ID and install to /data/ssh/.ssh/
- Run provision directly instead of through qt_shell wrapper
- Fix panda and body SConscripts to mkdir obj/ before writing gitversion.h
- Add sudo to su - comma build call
- Remount / rw at top of provision

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

system/clearpilot/on_start.sh

@@ -14,5 +14,5 @@ nmcli radio wifi on 2>/dev/null
 
 # Provision (packages, git pull, build) if no quick_boot flag
 if [ ! -f /data/quick_boot ]; then
-    /data/openpilot/system/clearpilot/tools/qt_shell "/data/openpilot/system/clearpilot/provision_wrapper.sh" --title="ClearPilot Provision"
+    bash /data/openpilot/system/clearpilot/provision.sh
 fi