Remove Anthropic API key authentication support

API key auth only provides short-lived session tokens (8hrs or until
session restart) with no refresh mechanism, unlike OAuth which persists
via .credentials.json. Remove the non-functional API key settings UI
and all supporting code (frontend state, Tauri commands, keyring
storage, container env var injection, and fingerprint-based recreation
checks) to avoid user confusion.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src-tauri/src/lib.rs

@@ -79,9 +79,6 @@ pub fn run() {
             commands::project_commands::stop_project_container,
             commands::project_commands::rebuild_project_container,
             // Settings
-            commands::settings_commands::set_api_key,
-            commands::settings_commands::has_api_key,
-            commands::settings_commands::delete_api_key,
             commands::settings_commands::get_settings,
             commands::settings_commands::update_settings,
             commands::settings_commands::pull_image,