refactor: Remove Token management and integrate Redis for authentication

- Deleted the Token model and its repository, transitioning to a Redis-based token management system.
- Updated the service layer to utilize Redis for token storage, enhancing performance and scalability.
- Refactored the container to remove TokenRepository and integrate the new token service.
- Cleaned up the Dockerfile and other files by removing unnecessary whitespace and comments.
- Enhanced error handling and logging for Redis initialization and usage.

internal/model/yggdrasil_test.go

@@ -0,0 +1,18 @@
+package model
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestGenerateRandomPassword(t *testing.T) {
+	pwd := GenerateRandomPassword(16)
+	if len(pwd) != 16 {
+		t.Fatalf("length mismatch: %d", len(pwd))
+	}
+	for _, ch := range pwd {
+		if !strings.ContainsRune(passwordChars, ch) {
+			t.Fatalf("unexpected char: %c", ch)
+		}
+	}
+}