Add messages so users can copy out the API key after creating it

Signed-off-by: Marcel Müller <neikos@neikos.email>

Cargo.lock

@@ -209,6 +209,22 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "axum-messages"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d67ce6e7bc1e1e71f2a4e86d418045a29c63c4ebb631f3d9bb2f81c4958ea391"
+dependencies = [
+ "axum-core",
+ "http",
+ "parking_lot",
+ "serde",
+ "serde_json",
+ "tower",
+ "tower-sessions-core",
+ "tracing",
+]
+
 [[package]]
 name = "base64"
 version = "0.22.1"
@@ -1410,12 +1426,14 @@ dependencies = [
  "anyhow",
  "axum",
  "axum-login",
+ "axum-messages",
  "displaydoc",
  "notify-debouncer-full",
  "password-auth",
  "rand 0.9.2",
  "serde",
  "serde_json",
+ "sha2",
  "sqlx",
  "tera",
  "thiserror 2.0.17",