fix: dual-mode installer — works with or without sudo

Installer now detects at runtime if it can get root access:
- Root/NOPASSWD sudo: installs to system directories with systemd
- No root: installs to ~/.local/bin with @reboot cron job

Self-elevation uses 'script -qc sudo bash' for requiretty, or falls
back to user mode without hanging on password prompts.

Uninstaller checks both system and user paths.

install/agent-uninstall.sh

@@ -1,29 +1,35 @@
 #!/bin/bash
 # ServerManager Agent Uninstaller
 
-# Self-elevate if not running as root
-if [ "$(id -u)" -ne 0 ]; then
-    if command -v script >/dev/null 2>&1; then
-        exec script -q -c "sudo bash '$0'" /dev/null
-    fi
-    exec sudo bash "$0"
+# Try system paths first, fall back to user paths
+if [ -f /usr/local/bin/servermanager-agent ]; then
+    echo "[1/3] Stopping and disabling service..."
+    systemctl stop servermanager-agent 2>/dev/null || true
+    systemctl disable servermanager-agent 2>/dev/null || true
+    systemctl daemon-reload 2>/dev/null || true
+
+    echo "[2/3] Removing system files..."
+    rm -f /usr/local/bin/servermanager-agent 2>/dev/null || true
+    rm -rf /etc/servermanager 2>/dev/null || true
+    rm -f /etc/systemd/system/servermanager-agent.service 2>/dev/null || true
+
+    echo "[3/3] Reloading systemd..."
+    systemctl daemon-reload 2>/dev/null || true
+elif [ -f "$HOME/.local/bin/servermanager-agent" ]; then
+    echo "[1/2] Removing cron job..."
+    crontab -l 2>/dev/null | grep -v 'servermanager-agent' | crontab - 2>/dev/null || true
+
+    echo "[2/2] Removing user files..."
+    rm -f "$HOME/.local/bin/servermanager-agent" 2>/dev/null || true
+    rm -rf "$HOME/.config/servermanager" 2>/dev/null || true
+else
+    echo "Agent is not installed."
+    # Still try to clean up any leftover system files
+    rm -f /usr/local/bin/servermanager-agent 2>/dev/null || true
+    rm -rf /etc/servermanager 2>/dev/null || true
+    rm -f /etc/systemd/system/servermanager-agent.service 2>/dev/null || true
+    systemctl daemon-reload 2>/dev/null || true
+    crontab -l 2>/dev/null | grep -v 'servermanager-agent' | crontab - 2>/dev/null || true
 fi
 
-AGENT_BIN="/usr/local/bin/servermanager-agent"
-CONFIG_DIR="/etc/servermanager"
-SERVICE_FILE="/etc/systemd/system/servermanager-agent.service"
-
-echo "[1/3] Stopping and disabling service..."
-systemctl stop servermanager-agent 2>/dev/null || true
-systemctl disable servermanager-agent 2>/dev/null || true
-systemctl daemon-reload 2>/dev/null || true
-
-echo "[2/3] Removing files..."
-rm -f "$AGENT_BIN" 2>/dev/null || true
-rm -rf "$CONFIG_DIR" 2>/dev/null || true
-rm -f "$SERVICE_FILE" 2>/dev/null || true
-
-echo "[3/3] Reloading systemd..."
-systemctl daemon-reload 2>/dev/null || true
-
 echo "ServerManager Agent uninstalled successfully."