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>

uv.lock

@@ -43,7 +43,7 @@ wheels = [
 ]
 
 [[package]]
-name = "peo"
+name = "boltage"
 source = { editable = "." }
 dependencies = [
     { name = "psycopg" },