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, 69 deletions

diff --git a/libs/nak/src/dxvk.rs b/libs/nak/src/dxvk.rs
deleted file mode 100644
index b335773..0000000
--- a/libs/nak/src/dxvk.rs
+++ /dev/null
@@ -1,69 +0,0 @@
-//! DXVK configuration management for Fluorine Manager.
-//!
-//! Downloads dxvk.conf from upstream, appends Fluorine-specific settings,
-//! and stores at `~/.local/share/fluorine/config/dxvk.conf`.
-
-use std::error::Error;
-use std::fs;
-use std::path::{Path, PathBuf};
-
-use crate::logging::{log_info, log_warning};
-
-const DXVK_CONF_URL: &str =
-    "https://raw.githubusercontent.com/doitsujin/dxvk/master/dxvk.conf";
-
-const DXVK_CUSTOM_SETTINGS: &str = r#"
-# Fluorine Custom Settings
-# Disable Graphics Pipeline Library (can cause issues with modded games)
-dxvk.enableGraphicsPipelineLibrary = False
-"#;
-
-/// Get the path where the DXVK config will be stored.
-pub fn get_dxvk_conf_path() -> PathBuf {
-    crate::paths::data_dir().join("config/dxvk.conf")
-}
-
-/// Ensure the dxvk.conf file exists, downloading if necessary.
-///
-/// Returns the path to the config file.
-pub fn ensure_dxvk_conf() -> Result<PathBuf, Box<dyn Error>> {
-    let conf_path = get_dxvk_conf_path();
-
-    // If it already exists, return it
-    if conf_path.exists() {
-        return Ok(conf_path);
-    }
-
-    download_and_create_dxvk_conf(&conf_path)
-}
-
-/// Download the upstream dxvk.conf, append custom settings, and write to `dest`.
-pub fn download_and_create_dxvk_conf(dest: &Path) -> Result<PathBuf, Box<dyn Error>> {
-    // Ensure parent directory exists
-    if let Some(parent) = dest.parent() {
-        fs::create_dir_all(parent)?;
-    }
-
-    log_info("Downloading dxvk.conf from upstream...");
-
-    let upstream_content = match ureq::get(DXVK_CONF_URL).call() {
-        Ok(response) => {
-            let mut body = String::new();
-            response.into_reader().read_to_string(&mut body)?;
-            body
-        }
-        Err(e) => {
-            log_warning(&format!("Failed to download dxvk.conf: {}", e));
-            // Create with just custom settings if download fails
-            String::new()
-        }
-    };
-
-    let full_content = format!("{}\n{}", upstream_content, DXVK_CUSTOM_SETTINGS);
-    fs::write(dest, &full_content)?;
-
-    log_info(&format!("Created dxvk.conf at {:?}", dest));
-    Ok(dest.to_path_buf())
-}
-
-use std::io::Read as _;