fix(deploy): check auth before init dialog

[pat-s]

Summary

• Move resolve_server call to before the _ricochet.toml check so users without an API key get an actionable error immediately, instead of going through the entire init dialog only to hit "No API key configured" at the end.
• Show target server URL in the init prompt so users know where the deploy will go before answering.
• Remove duplicate resolve_server call at the old location since server_config is already in scope.

fix #97

[JosiahParry]

I've pulled out the preflight_key_check() from #63 and put it in here combining the language.

We can now use

let server_config = config.resolve_server(server_ref)?;
let client = RicochetClient::new(&server_config)?;
client.preflight_key_check().await?;

wherever we need to check a key.

Edit: some toml tests are failing—checking
Edit 2: just one auth failure related to ordering of tests

[JosiahParry]

Added a helper preflight_key_check() that can be used in all auth-needed commands to ensure we don't have duplicate code.

Due to putting checks first, some tests failed. Addressed these failures with mocks and serial ordering.