Fix Fedora DNF5 compatibility and distro-specific packages

Key changes:
- lib/distro.sh: replace REPO_ADD_RPM variable with repo_add_rpm()
  function (DNF5 changed 'config-manager --add-repo' to
  'config-manager addrepo --from-repofile=')
- 01-repos.sh: use repo_add_rpm function; add Ghostty COPR for
  Fedora; remove Signal RPM repo (no official one — use Flatpak)
- 02-packages.sh: lowercase 'development-tools' group for DNF5;
  add python3-devel (needed for native extensions like evdev);
  swap ffmpeg-free → ffmpeg via RPM Fusion for full codec support;
  use tuned (preinstalled on Fedora) instead of TLP
- 11-tweaks.sh: conditional power management — TLP on Debian,
  tuned on Fedora

stages/02-packages.sh

@@ -14,10 +14,11 @@ info "Installing system packages (this may take a while)..."
 #  A. Development tools & compilers
 # ===========================================================================
 echo "    Development tools..."
-pkg_group_install "Development Tools"  # Fedora only
+pkg_group_install "development-tools"  # Fedora only
 
 # Common dev packages (same name on both)
 pkg_install cmake
+pkg_install python3-devel  # Needed for building native extensions (evdev, etc.)
 
 # Differently-named dev packages
 pkg_install_mapped "build-essential" "@development-tools"
@@ -32,6 +33,13 @@ fi
 
 pkg_install dkms
 
+# ---- Swap ffmpeg-free → ffmpeg from RPM Fusion (for full codec support) ----
+# Fedora ships ffmpeg-free in main repos, but RPM Fusion's ffmpeg has more codecs
+if rpm -q ffmpeg-free &>/dev/null; then
+  echo "    Swapping ffmpeg-free → ffmpeg (RPM Fusion)..."
+  sudo dnf swap -y ffmpeg-free ffmpeg --allowerasing 2>/dev/null && ok "  ffmpeg swapped" || warn "  ffmpeg swap had issues."
+fi
+
 # ===========================================================================
 #  B. CLI utilities
 # ===========================================================================
@@ -87,11 +95,12 @@ pkg_install \
   smartmontools \
   solaar 2>/dev/null || warn "  Some system tools failed."
 
-# TLP — laptop power management
+# Power management — use tuned on Fedora, TLP on Debian
 if [ "$DISTRO_FAMILY" = "debian" ]; then
   pkg_install tlp 2>/dev/null || warn "  tlp not available."
 else
-  pkg_install tlp tlp-rdw 2>/dev/null || warn "  tlp not available."
+  # tuned is preinstalled on Fedora Workstation — just enable it
+  $SERVICE_ENABLE tuned 2>/dev/null || true
 fi
 
 # ===========================================================================
@@ -106,7 +115,7 @@ pkg_install \
   p7zip 2>/dev/null || true
 
 # ---- Ghostty terminal emulator ----
-# Fedora: in official repos since F40
+# Fedora: via COPR (scottames/ghostty) added in stage 01
 # Ubuntu/Pop: via PPA (added in stage 01)
 echo "    Ghostty terminal emulator..."
 pkg_install ghostty 2>/dev/null || warn "  ghostty install failed."
@@ -118,8 +127,12 @@ pkg_install code 2>/dev/null || warn "  code install failed."
 # ===========================================================================
 #  Start enabled services
 # ===========================================================================
-if command -v tlp &>/dev/null; then
+if [ "$DISTRO_FAMILY" = "debian" ] && command -v tlp &>/dev/null; then
   $SERVICE_ENABLE tlp 2>/dev/null || true
 fi
+# tuned is already enabled by default on Fedora, but ensure it's running
+if [ "$DISTRO_FAMILY" = "fedora" ] && command -v tuned &>/dev/null; then
+  $SERVICE_ENABLE tuned 2>/dev/null || true
+fi
 
 ok "Stage 02 complete: system packages installed."