Rename project: ubuntu-fido -> authforge

Renames the package and all artifacts to authforge to drop the
distro-specific prefix, since the roadmap targets Ubuntu + Debian +
KDE + eventually Fedora (option C in the design).

- deb packages: authforge, authforge-{daemon,pam,cli,gui,gnome-integration}
- binaries: authforged, authforgectl, authforge (GUI)
- D-Bus name: io.dangerousthings.AuthForge
- PAM module: pam_authforge_pending.so
- Paths: /etc/authforge/, /var/lib/authforge/, /usr/share/pam-configs/authforge
- PPA: ppa:dangerousthings/authforge

Filesystem path /home/work/VSCodeProjects/ubuntu_fido/ left as-is for
historical reference; can rename later via git mv at the dir level.

Verified: cargo build/test/clippy/fmt clean, pam builds, gui builds,
all 5 debs produced.

README.md

@@ -1,18 +1,18 @@
-# ubuntu-fido
+# authforge
 
-Turnkey U2F / FIDO2 passkey / TOTP MFA for Ubuntu desktops.
+Turnkey U2F / FIDO2 passkey / TOTP MFA for Linux desktops. v1 ships on Ubuntu LTS + GNOME; Debian and KDE Plasma are on the roadmap.
 
 ## Install (end users)
 
-    sudo add-apt-repository ppa:dangerousthings/ubuntu-fido
-    sudo apt install ubuntu-fido
+    sudo add-apt-repository ppa:dangerousthings/authforge
+    sudo apt install authforge
 
 ## Build from source
 
-See `docs/BUILDING.md`.
+See [docs/BUILDING.md](docs/BUILDING.md).
 
 ## Status
 
-Pre-alpha. See `docs/plans/` for design and roadmap.
+Pre-alpha. See [docs/plans/](docs/plans/) for design and roadmap.
 
 Copyright 2026 Dangerous Things, LLC. Licensed under the Apache License, Version 2.0.