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, 11 deletions

diff --git a/libs/nak/src/paths.rs b/libs/nak/src/paths.rs
deleted file mode 100644
index f6dde6c..0000000
--- a/libs/nak/src/paths.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-//! Shared data directory for Fluorine Manager.
-//!
-//! All data lives under `~/.local/share/fluorine/`.
-
-use std::path::PathBuf;
-
-/// Returns the Fluorine data directory (`~/.local/share/fluorine`).
-pub fn data_dir() -> PathBuf {
-    let home = std::env::var("HOME").unwrap_or_else(|_| "/tmp".to_string());
-    PathBuf::from(home).join(".local/share/fluorine")
-}