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historical reference; can rename later via git mv at the dir level.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

pam/Makefile

@@ -1,13 +1,13 @@
 CFLAGS ?= -Wall -Wextra -Werror -fPIC -O2
 LIBDIR ?= /usr/lib/$(shell dpkg-architecture -qDEB_HOST_MULTIARCH)/security
 
-pam_ubuntu_fido_pending.so: pam_ubuntu_fido_pending.c
+pam_authforge_pending.so: pam_authforge_pending.c
 	$(CC) $(CFLAGS) -shared -o $@ $< -lpam
 
-install: pam_ubuntu_fido_pending.so
-	install -D -m 0644 pam_ubuntu_fido_pending.so $(DESTDIR)$(LIBDIR)/pam_ubuntu_fido_pending.so
+install: pam_authforge_pending.so
+	install -D -m 0644 pam_authforge_pending.so $(DESTDIR)$(LIBDIR)/pam_authforge_pending.so
 
 clean:
-	rm -f pam_ubuntu_fido_pending.so
+	rm -f pam_authforge_pending.so
 
 .PHONY: install clean

pam/pam_authforge_pending.c

@@ -7,7 +7,7 @@
 PAM_EXTERN int pam_sm_authenticate(pam_handle_t *pamh, int flags,
                                     int argc, const char **argv) {
     (void)flags; (void)argc; (void)argv;
-    pam_syslog(pamh, LOG_INFO, "ubuntu_fido_pending: stub - allowing");
+    pam_syslog(pamh, LOG_INFO, "authforge_pending: stub - allowing");
     return PAM_IGNORE; /* implemented in Phase 6 */
 }