fix: add root detection for setcap and rfkill commands in CI

The installer was failing in CI Docker containers with "sudo: command
not found" because Docker containers run as root and don't have sudo
installed. Added root detection (checking $EUID) before setcap and
rfkill commands, following the same pattern used elsewhere in the script.

This allows the installer to work correctly in both scenarios:
- User systems: Uses sudo when needed (non-root users)
- Docker/CI containers: Runs commands directly as root (no sudo required)

Fixes the CI failure at install.sh:458 where setcap was unconditionally
using sudo, and prevents future failures at the rfkill command.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

install.sh

@@ -455,7 +455,12 @@ else
         # Grant capabilities if we have a valid path
         if [ -f "$PYTHON_PATH" ] && [ ! -L "$PYTHON_PATH" ]; then
             print_info "Granting capabilities to: $PYTHON_PATH"
-            sudo setcap 'cap_net_raw,cap_net_admin+eip' "$PYTHON_PATH"
+            # Use sudo only if not running as root (Docker containers run as root without sudo)
+            if [ "$EUID" -eq 0 ]; then
+                setcap 'cap_net_raw,cap_net_admin+eip' "$PYTHON_PATH"
+            else
+                sudo setcap 'cap_net_raw,cap_net_admin+eip' "$PYTHON_PATH"
+            fi
 
             if [ $? -eq 0 ]; then
                 print_success "Bluetooth permissions granted successfully"
@@ -629,7 +634,12 @@ if command -v bluetoothctl &> /dev/null; then
         if rfkill list bluetooth | grep -q "Soft blocked: yes"; then
             print_warning "Bluetooth adapter is soft-blocked by rfkill"
             print_info "Unblocking Bluetooth adapter..."
-            sudo rfkill unblock bluetooth
+            # Use sudo only if not running as root (Docker containers run as root without sudo)
+            if [ "$EUID" -eq 0 ]; then
+                rfkill unblock bluetooth
+            else
+                sudo rfkill unblock bluetooth
+            fi
             sleep 1
 
             # Verify unblock succeeded