Refactor module naming and update references to steamcache2

- Changed module name from `s1d3sw1ped/SteamCache2` to `s1d3sw1ped/steamcache2` for consistency.
- Updated all import paths and references throughout the codebase to reflect the new module name.
- Adjusted README and Makefile to use the updated module name, ensuring clarity in usage instructions.

vfs/disk/disk.go

@@ -7,9 +7,9 @@ import (
 	"io"
 	"os"
 	"path/filepath"
-	"s1d3sw1ped/SteamCache2/steamcache/logger"
-	"s1d3sw1ped/SteamCache2/vfs"
-	"s1d3sw1ped/SteamCache2/vfs/vfserror"
+	"s1d3sw1ped/steamcache2/steamcache/logger"
+	"s1d3sw1ped/steamcache2/vfs"
+	"s1d3sw1ped/steamcache2/vfs/vfserror"
 	"sort"
 	"strings"
 	"sync"
@@ -186,9 +186,7 @@ func (d *DiskFS) init() {
 		// Extract key from sharded path: remove root and convert sharding back
 		// Handle both "./disk" and "disk" root paths
 		rootPath := d.root
-		if strings.HasPrefix(rootPath, "./") {
-			rootPath = rootPath[2:] // Remove "./" prefix
-		}
+		rootPath = strings.TrimPrefix(rootPath, "./")
 		relPath := strings.ReplaceAll(npath[len(rootPath)+1:], "\\", "/")
 
 		// Extract the original key from the sharded path