feat(src/hardware): add battery placeholder and GPU detection utilities

New Features:
- Battery module with placeholder `info` function.
- GPU module with functions to detect NVIDIA mode, retrieve PCI bus IDs, identify Intel/AMD iGPU vendors, and extract AMD GPU names via xrandr.

Enhancements:
- Add logging for diagnostic messages and runtime checks.
- Include safety validation for external commands (lspci, xrandr) and configuration files.

src/hardware/battery.rs

@@ -0,0 +1,3 @@
+pub fn info() {
+    println!("Hardware battery placeholder");
+}

src/hardware/gpu.rs

@@ -0,0 +1,89 @@
+use log::{error, info, warn};
+use regex::Regex;
+use std::path::Path;
+use std::process::Command;
+
+pub fn get_current_mode() -> String {
+    let blacklist_path = Path::new("/etc/modprobe.d/blacklist-nvidia.conf");
+    let udev_integrated_path = Path::new("/etc/udev/rules.d/50-remove-nvidia.rules");
+    let old_udev_path = Path::new("/lib/udev/rules.d/50-remove-nvidia.rules");
+    let xorg_path = Path::new("/etc/X11/xorg.conf");
+    let wayland_marker = Path::new("/etc/lapctl-wayland-nvidia");
+    let modeset_path = Path::new("/etc/modprobe.d/nvidia.conf");
+
+    if blacklist_path.exists() && (udev_integrated_path.exists() || old_udev_path.exists()) {
+        "integrated".to_string()
+    } else if (xorg_path.exists() || wayland_marker.exists()) && modeset_path.exists() {
+        "nvidia".to_string()
+    } else {
+        "hybrid".to_string()
+    }
+}
+
+pub fn get_nvidia_gpu_pci_bus() -> String {
+    let output = Command::new("lspci").output().expect("Failed to execute lspci");
+    let lspci_output = String::from_utf8_lossy(&output.stdout);
+
+    for line in lspci_output.lines() {
+        if line.contains("NVIDIA") && (line.contains("VGA compatible controller") || line.contains("3D controller")) {
+            let pci_bus_id_raw = line.split_whitespace().next().unwrap();
+            let pci_bus_id = pci_bus_id_raw.replace("0000:", "");
+            info!("Found Nvidia GPU at {}", pci_bus_id);
+
+            let parts: Vec<&str> = pci_bus_id.split(':').collect();
+            let bus = parts[0];
+            let device_fun: Vec<&str> = parts[1].split('.').collect();
+            let device = device_fun[0];
+            let function = device_fun[1];
+
+            return format!(
+                "PCI:{}:{}:{}",
+                u32::from_str_radix(bus, 16).unwrap_or(0),
+                u32::from_str_radix(device, 16).unwrap_or(0),
+                u32::from_str_radix(function, 16).unwrap_or(0)
+            );
+        }
+    }
+
+    error!("Could not find Nvidia GPU");
+    println!("Try switching to hybrid mode first!");
+    std::process::exit(1);
+}
+
+pub fn get_igpu_vendor() -> Option<String> {
+    let output = Command::new("lspci").output().ok()?;
+    let lspci_output = String::from_utf8_lossy(&output.stdout);
+
+    for line in lspci_output.lines() {
+        if line.contains("VGA compatible controller") || line.contains("Display controller") {
+            if line.contains("Intel") {
+                info!("Found Intel iGPU");
+                return Some("intel".to_string());
+            } else if line.contains("ATI") || line.contains("AMD") {
+                info!("Found AMD iGPU");
+                return Some("amd".to_string());
+            }
+        }
+    }
+    warn!("Could not find Intel or AMD iGPU");
+    None
+}
+
+pub fn get_amd_igpu_name() -> Option<String> {
+    if !Path::new("/usr/bin/xrandr").exists() {
+        warn!("The 'xrandr' command is not available. Make sure the package is installed!");
+        return None;
+    }
+
+    let output = Command::new("xrandr").arg("--listproviders").output().ok()?;
+    let xrandr_output = String::from_utf8_lossy(&output.stdout);
+
+    let pattern = Regex::new(r"name:.*(ATI|AMD|AMD/ATI)").unwrap();
+    if let Some(mat) = pattern.find(&xrandr_output) {
+        let matched_str = mat.as_str();
+        return Some(matched_str[5..].trim().to_string());
+    }
+
+    warn!("Could not find AMD iGPU in 'xrandr' output.");
+    None
+}

src/hardware/mod.rs

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+pub mod battery;
+pub mod gpu;