fix: make all scripts resolve paths relative to repo root

CloneVendorRepos.sh and CleanVendor.sh resolved vendor/ relative to scripts/
instead of the repo root, so vendor repos were cloned to the wrong location
(scripts/vendor) and docker-compose builds (which expect ./vendor at repo
root) would fail. BuildAll.sh and StatusCheck.sh had the same issue, cd-ing
to scripts/ instead of the repo root before running docker compose.

Also updated validate-all.sh with the 10 newer MCP servers that were added
after the script was last maintained (firefly-iii, actual, paperless, beszel,
gitea, grafana, ha, limesurvey, linkwarden, superset) plus added missing
env vars for audiobook-mcp and drawio-mcp.

scripts/CleanVendor.sh

@@ -22,8 +22,9 @@ if [ "$CONFIRM" != "yes" ]; then
     exit 0
 fi
 
-# Vendor directory
-VENDOR_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/vendor"
+# Vendor directory (repo root is parent of scripts/)
+REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+VENDOR_DIR="$REPO_ROOT/vendor"
 
 echo ""
 echo "Removing vendor directories..."