Rename the project from peo to boltage

The name peo cannot be registered on PyPI. Rename the package, the
command, the PEO_* environment variables (now BOLTAGE_*), the container
paths and scripts, and the source URLs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

container/pgadmin/compose-servers.json

@@ -1,7 +1,7 @@
 {
   "Servers": {
     "1": {
-      "Name": "peo",
+      "Name": "boltage",
       "Group": "Servers",
       "Host": "postgres",
       "Port": 5432,