Refactor configuration management and enhance build process

- Introduced a YAML-based configuration system, allowing for automatic generation of a default `config.yaml` file.
- Updated the application to load configuration settings from the YAML file, improving flexibility and ease of use.
- Added a Makefile to streamline development tasks, including running the application, testing, and managing dependencies.
- Enhanced `.gitignore` to include build artifacts and configuration files.
- Removed unused Prometheus metrics and related code to simplify the codebase.
- Updated dependencies in `go.mod` and `go.sum` for improved functionality and performance.

vfs/gc/gc_test.go

@@ -1,42 +0,0 @@
-// vfs/gc/gc_test.go
-package gc
-
-import (
-	"testing"
-)
-
-func TestGetGCAlgorithm(t *testing.T) {
-	tests := []struct {
-		name      string
-		algorithm GCAlgorithm
-		expected  bool // true if we expect a non-nil function
-	}{
-		{"LRU", LRU, true},
-		{"LFU", LFU, true},
-		{"FIFO", FIFO, true},
-		{"Largest", Largest, true},
-		{"Smallest", Smallest, true},
-		{"Hybrid", Hybrid, true},
-		{"Unknown", "unknown", true}, // should fall back to LRU
-		{"Empty", "", true},          // should fall back to LRU
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			fn := GetGCAlgorithm(tt.algorithm)
-			if fn == nil {
-				t.Errorf("GetGCAlgorithm(%s) returned nil, expected non-nil function", tt.algorithm)
-			}
-		})
-	}
-}
-
-func TestGCAlgorithmConstants(t *testing.T) {
-	expectedAlgorithms := []GCAlgorithm{LRU, LFU, FIFO, Largest, Smallest, Hybrid}
-
-	for _, algo := range expectedAlgorithms {
-		if algo == "" {
-			t.Errorf("GC algorithm constant is empty")
-		}
-	}
-}