Add Doris Schoolhouse and clean pending homelab changes

home/doris-schoolhouse/bin/check-env.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+have() { command -v "$1" >/dev/null 2>&1; }
+
+printf 'Doris Schoolhouse environment check\n'
+printf '================================\n'
+
+for cmd in python3 ffmpeg psql docker curl; do
+  if have "$cmd"; then
+    printf '%-10s %s\n' "$cmd" "$(command -v "$cmd")"
+  else
+    printf '%-10s %s\n' "$cmd" "MISSING"
+  fi
+done
+
+python3 - <<'PY'
+import importlib.util
+mods = ['fastapi', 'uvicorn', 'psycopg']
+for mod in mods:
+    print(f'{mod:10} ', 'installed' if importlib.util.find_spec(mod) else 'MISSING')
+PY