fix: satisfy clippy -D warnings so CI can pass

CI runs `cargo clippy -- -D warnings`, which already failed on main with
four errors predating this branch:

  duplicated attribute            src/models.rs, src/config.rs
  literal with an empty format    src/cli_main.rs (x2)

Both structs carried #[allow(dead_code)] twice; dropped the duplicate.
The println! calls moved the literal into the format string as clippy
suggested. No behaviour change -- output is byte-identical.

Kept separate from the feature commit so it can be dropped or landed on
its own.

src/cli_main.rs

@@ -65,7 +65,7 @@ fn main() {
             if users.is_empty() {
                 println!("No users.");
             } else {
-                println!("{:<20} {}", "Username", "Created");
+                println!("{:<20} Created", "Username");
                 println!("{}", "-".repeat(40));
                 for (u, c) in users {
                     println!("{:<20} {}", u, c);
@@ -115,7 +115,7 @@ fn main() {
             if keys.is_empty() {
                 println!("No API keys.");
             } else {
-                println!("{:<20} {}", "Label", "Created");
+                println!("{:<20} Created", "Label");
                 println!("{}", "-".repeat(40));
                 for (l, c) in keys {
                     println!("{:<20} {}", l, c);

src/config.rs

@@ -1,7 +1,6 @@
 use serde::Deserialize;
 use std::fs;
 
-#[allow(dead_code)]
 #[derive(Debug, Deserialize, Clone)]
 #[allow(dead_code)]
 pub struct Config {

src/models.rs

@@ -27,7 +27,6 @@ pub struct SubmitAction {
     pub run_as: Option<String>,
 }
 
-#[allow(dead_code)]
 #[derive(Debug, Serialize)]
 #[allow(dead_code)]
 pub struct ActionResult {