Own identity and versioning: plm-electrumx 1.0.0

Package name plm-electrumx, project URLs, keywords and description for
Palladium. BRANDING and the version string seen by clients (server.version,
banner, logs) become plm-electrumx 1.0.0. SECURITY.md points to this
repository's private vulnerability reporting.

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

src/electrumx/__init__.py

@@ -5,7 +5,7 @@ from electrumx.server.controller import Controller
 from electrumx.server.env import Env
 
 
-BRANDING = "spesmilo"
-__version__ = "2.0.0"
-version = f'ElectrumX {__version__}'
+BRANDING = "plm-electrumx"
+__version__ = "1.0.0"
+version = f'plm-electrumx {__version__}'
 version_short = __version__