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historical reference; can rename later via git mv at the dir level.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

Cargo.toml

@@ -2,7 +2,7 @@
 resolver = "2"
 members = ["common", "daemon", "cli", "gui"]
 # GUI excluded from default builds because it requires libgtk-4-dev + libadwaita-1-dev
-# at link time. Build it explicitly with `cargo build -p ubuntu-fido-gui`.
+# at link time. Build it explicitly with `cargo build -p authforge-gui`.
 default-members = ["common", "daemon", "cli"]
 
 [workspace.package]
@@ -10,7 +10,7 @@ version = "0.1.0"
 edition = "2021"
 license = "Apache-2.0"
 authors = ["Dangerous Things <ops@dangerousthings.com>"]
-repository = "https://github.com/dangerousthings/ubuntu-fido"
+repository = "https://github.com/dangerousthings/authforge"
 rust-version = "1.78"
 
 [workspace.dependencies]