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, 19 deletions

diff --git a/libs/nak/src/utils.rs b/libs/nak/src/utils.rs
deleted file mode 100644
index 7d7886c..0000000
--- a/libs/nak/src/utils.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-//! Shared utility functions used across the application
-
-use std::error::Error;
-use std::fs;
-use std::path::Path;
-
-/// Download a file from URL to the specified path
-pub fn download_file(url: &str, path: &Path) -> Result<(), Box<dyn Error>> {
-    // Ensure parent directory exists
-    if let Some(parent) = path.parent() {
-        fs::create_dir_all(parent)?;
-    }
-
-    let resp = ureq::get(url).call()?;
-    let mut reader = resp.into_reader();
-    let mut file = fs::File::create(path)?;
-    std::io::copy(&mut reader, &mut file)?;
-    Ok(())
-}