Remove NaK/Rust dependency, port remaining functionality to native C++

Replace NaK Rust crate and nak_ffi with native C++ implementations:
- Game detection (Steam, Heroic, Bottles), VDF parser, icon extraction
- Prefix symlinks, SLR manager, Steam path detection
- Known games database

Add FUSE VFS optimizations: zero-copy reads via fuse_reply_data,
default_permissions mount option, FUSE_CAP_ASYNC_DIO, FUSE_CAP_EXPIRE_ONLY,
lookup cache parent index, cached mode bits, increased I/O buffer sizes.

Update build system, prefix setup, and various fixes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

1 files changed, 0 insertions, 135 deletions

diff --git a/libs/nak/src/steam/mod.rs b/libs/nak/src/steam/mod.rs
deleted file mode 100644
index c5964aa..0000000
--- a/libs/nak/src/steam/mod.rs
+++ /dev/null
@@ -1,135 +0,0 @@
-//! Steam integration module
-//!
-//! Handles Proton detection, Steam path detection, and mount point discovery.
-//! Shortcuts and config.vdf manipulation removed (handled by C++ side).
-
-mod paths;
-mod proton;
-
-// Re-export path detection utilities
-pub use paths::{
-    detect_steam_path_checked, find_steam_path, find_userdata_path,
-    get_steam_accounts,
-};
-
-// Re-export Proton detection
-pub use proton::{find_steam_protons, SteamProton};
-
-use std::fs;
-
-/// Kill Steam process gracefully, then force if needed
-pub fn kill_steam() -> Result<(), Box<dyn std::error::Error>> {
-    use std::process::Command;
-
-    // Try steam -shutdown first (graceful)
-    let _ = Command::new("steam")
-        .arg("-shutdown")
-        .status();
-
-    std::thread::sleep(std::time::Duration::from_secs(2));
-
-    // Then force kill if still running
-    let _ = Command::new("pkill")
-        .arg("-9")
-        .arg("steam")
-        .status();
-
-    // Brief wait for Steam to fully exit
-    std::thread::sleep(std::time::Duration::from_secs(2));
-
-    Ok(())
-}
-
-/// Start Steam in background
-pub fn start_steam() -> Result<(), Box<dyn std::error::Error>> {
-    use std::process::{Command, Stdio};
-
-    Command::new("setsid")
-        .arg("steam")
-        .arg("-silent")
-        .stdout(Stdio::null())
-        .stderr(Stdio::null())
-        .spawn()?;
-
-    Ok(())
-}
-
-/// Restart Steam (kill then start)
-pub fn restart_steam() -> Result<(), Box<dyn std::error::Error>> {
-    kill_steam()?;
-    start_steam()?;
-    Ok(())
-}
-
-// ============================================================================
-// STEAM_COMPAT_MOUNTS Detection
-// ============================================================================
-
-/// Directories that pressure-vessel already exposes by default
-const ALREADY_EXPOSED: &[&str] = &[
-    "bin", "etc", "home", "lib", "lib32", "lib64",
-    "overrides", "run", "sbin", "tmp", "usr", "var",
-];
-
-/// System directories that shouldn't be mounted
-const SYSTEM_DIRS: &[&str] = &[
-    "proc", "sys", "dev", "boot", "root", "lost+found", "snap",
-];
-
-/// Detect directories at root that need to be added to STEAM_COMPAT_MOUNTS
-pub fn detect_extra_mounts() -> Vec<String> {
-    let mut mounts = Vec::new();
-
-    let Ok(entries) = fs::read_dir("/") else {
-        return mounts;
-    };
-
-    for entry in entries.flatten() {
-        let name = entry.file_name().to_string_lossy().to_string();
-
-        if ALREADY_EXPOSED.contains(&name.as_str()) {
-            continue;
-        }
-
-        if SYSTEM_DIRS.contains(&name.as_str()) {
-            continue;
-        }
-
-        if name.starts_with('.') {
-            continue;
-        }
-
-        if entry.path().is_dir() {
-            mounts.push(format!("/{}", name));
-        }
-    }
-
-    mounts.sort();
-    mounts
-}
-
-/// Generate launch options string with DXVK config file and STEAM_COMPAT_MOUNTS
-pub fn generate_launch_options(dxvk_conf_path: Option<&std::path::Path>, is_electron_app: bool) -> String {
-    let mounts = detect_extra_mounts();
-
-    let dxvk_part = match dxvk_conf_path {
-        Some(path) => format!(
-            "DXVK_CONFIG_FILE=\"{}\"",
-            crate::config::normalize_path_for_steam(&path.to_string_lossy())
-        ),
-        None => String::new(),
-    };
-
-    let electron_flags = if is_electron_app {
-        " --disable-gpu --no-sandbox"
-    } else {
-        ""
-    };
-
-    match (dxvk_part.is_empty(), mounts.is_empty()) {
-        (true, true) => format!("%command%{}", electron_flags),
-        (true, false) => format!("STEAM_COMPAT_MOUNTS={} %command%{}", mounts.join(":"), electron_flags),
-        (false, true) => format!("{} %command%{}", dxvk_part, electron_flags),
-        (false, false) => format!("{} STEAM_COMPAT_MOUNTS={} %command%{}", dxvk_part, mounts.join(":"), electron_flags),
-    }
-}