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/commands/settings_commands.rs

@@ -2,24 +2,8 @@ use tauri::State;
 
 use crate::docker;
 use crate::models::AppSettings;
-use crate::storage::secure;
 use crate::AppState;
 
-#[tauri::command]
-pub async fn set_api_key(key: String) -> Result<(), String> {
-    secure::store_api_key(&key)
-}
-
-#[tauri::command]
-pub async fn has_api_key() -> Result<bool, String> {
-    secure::has_api_key()
-}
-
-#[tauri::command]
-pub async fn delete_api_key() -> Result<(), String> {
-    secure::delete_api_key()
-}
-
 #[tauri::command]
 pub async fn get_settings(state: State<'_, AppState>) -> Result<AppSettings, String> {
     Ok(state.settings_store.get())