fix: improve uninstall script to better handle root directory cleanup

When gpugo is installed as a normal user with GPU_GO_TOKEN (agent mode),
the install script runs `sudo ggo agent register` which creates config
files in /root/.gpugo. During uninstall, these root directories may not
be cleaned up if sudo fails or is unavailable.

Improvements:
1. Better error handling for root directory cleanup
   - Explicitly check if removal succeeded
   - Capture and report failures

2. Enhanced binary search for unregistration
   - Search in multiple common locations (not just 2)
   - Include ~/.local/bin and ~/bin in search path
   - Show searched paths if binary not found

3. Clear manual cleanup instructions
   - If root cleanup fails, show warning banner
   - List exact commands needed for manual cleanup
   - Help users understand what still needs to be removed

4. More informative messages
   - Show which directories were successfully removed
   - Warn about permission issues explicitly

This fix addresses user reports of gpugo appearing to be "installed in
both root and normal user" after uninstall. The root directories are
intentionally created during agent mode install (systemd service runs
as root), but now uninstall provides clear guidance when they can't be
automatically removed.

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

Author: andystime

scripts/uninstall.sh

@@ -175,16 +175,52 @@ remove_config() {
     done
 
     # Root config (if running as root or with sudo)
+    local root_cleanup_failed=false
     if [ "$(id -u)" -eq 0 ] || [ -n "$(get_sudo)" ]; then
         if [ -d "/root/.config/ggo" ]; then
-            ${SUDO} rm -rf "/root/.config/ggo"
+            if ${SUDO} rm -rf "/root/.config/ggo" 2>/dev/null; then
+                info "Removed /root/.config/ggo"
+            else
+                warn "Failed to remove /root/.config/ggo (permission denied)"
+                root_cleanup_failed=true
+            fi
         fi
         if [ -d "/root/.gpugo" ]; then
-            ${SUDO} rm -rf "/root/.gpugo"
+            if ${SUDO} rm -rf "/root/.gpugo" 2>/dev/null; then
+                info "Removed /root/.gpugo"
+            else
+                warn "Failed to remove /root/.gpugo (permission denied)"
+                root_cleanup_failed=true
+            fi
+        fi
+    else
+        # Check if root directories exist but we can't remove them
+        if [ -d "/root/.config/ggo" ] || [ -d "/root/.gpugo" ]; then
+            warn "Root configuration directories exist but sudo is not available"
+            root_cleanup_failed=true
         fi
     fi
-    
+
     info "Configuration directories removed!"
+
+    # Warn about manual cleanup if root cleanup failed
+    if [ "${root_cleanup_failed}" = "true" ]; then
+        echo ""
+        warn "==============================================="
+        warn "  MANUAL CLEANUP REQUIRED"
+        warn "==============================================="
+        warn "Some configuration directories could not be removed automatically."
+        warn "Please run the following commands with appropriate permissions:"
+        warn ""
+        if [ -d "/root/.config/ggo" ]; then
+            warn "  sudo rm -rf /root/.config/ggo"
+        fi
+        if [ -d "/root/.gpugo" ]; then
+            warn "  sudo rm -rf /root/.gpugo"
+        fi
+        warn "==============================================="
+        echo ""
+    fi
 }
 
 # --- Kill running processes ---
@@ -206,17 +242,24 @@ kill_processes() {
 
 # --- Unregister from server ---
 unregister_from_server() {
-    local binary_path="${GGO_INSTALL_DIR:-/usr/local/bin}/${BINARY_NAME}"
-    if [ ! -f "${binary_path}" ]; then
-        binary_path="/usr/local/bin/${BINARY_NAME}"
-    fi
+    # Search for ggo binary in multiple locations
+    local binary_path=""
+    local search_paths="${GGO_INSTALL_DIR:-/usr/local/bin}/${BINARY_NAME} /usr/local/bin/${BINARY_NAME} /usr/bin/${BINARY_NAME} /opt/bin/${BINARY_NAME} ${HOME}/.local/bin/${BINARY_NAME} ${HOME}/bin/${BINARY_NAME}"
+
+    for path in ${search_paths}; do
+        if [ -f "${path}" ] && [ -x "${path}" ]; then
+            binary_path="${path}"
+            break
+        fi
+    done
 
-    if [ ! -f "${binary_path}" ]; then
-        warn "ggo binary not found, skipping server unregistration"
+    if [ -z "${binary_path}" ]; then
+        warn "ggo binary not found in common locations, skipping server unregistration"
+        warn "Searched: ${search_paths}"
         return 0
     fi
 
-    info "Unregistering agent from server..."
+    info "Unregistering agent from server (using binary at ${binary_path})..."
     if "${binary_path}" agent unregister --force 2>/dev/null; then
         info "Agent unregistered from server"
     else