Remove unused compression options, add man page installation

- Remove --compress/--algorithm CLI options (not wired to encode flow)
- Add man page installation to rpi/setup.sh
- Document man page installation in README.md and CLI.md
- Update man page to remove compression options

Compression will be properly implemented in v4.1.8.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

rpi/setup.sh

@@ -428,6 +428,14 @@ if [ -f "$INSTALL_DIR/rpi/skel/.bashrc" ]; then
     fi
 fi
 
+# Install man page
+if [ -f "$INSTALL_DIR/docs/stegasoo.1" ]; then
+    sudo mkdir -p /usr/local/share/man/man1
+    sudo cp "$INSTALL_DIR/docs/stegasoo.1" /usr/local/share/man/man1/
+    sudo mandb -q 2>/dev/null || true
+    echo "  Installed man page (man stegasoo)"
+fi
+
 echo -e "${GREEN}[12/12]${NC} Setting up login banner..."
 
 # Create dynamic MOTD script