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historical reference; can rename later via git mv at the dir level.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.

daemon/src/main.rs

@@ -6,7 +6,7 @@ async fn main() -> Result<()> {
     tracing_subscriber::fmt()
         .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
         .init();
-    info!("ubuntu-fidod {} starting", env!("CARGO_PKG_VERSION"));
+    info!("authforged {} starting", env!("CARGO_PKG_VERSION"));
     // D-Bus service registration in Phase 1.
     Ok(())
 }