feat: secrets of clients now need to be hashed, added command to create hash

example-config.yaml

@@ -13,7 +13,10 @@ upstream:
     api_token_file: "/path/to/your/hetzner_token.txt"
 clients:
   client1:
-    secret: "s3cr3t123"
+    # The client secret must be a bcrypt hash.
+    # Generate one using: go run ./cmd/updns hash-secret <your-secret>
+    # Or using htpasswd: htpasswd -nbB <username> <your-secret> | cut -d: -f2
+    secret_hash: "$2a$10$abcdefghijklmnopqrstuv" # Replace with your actual hash
     exact:
       - "home.example.com"
     wildcard: