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/store/appState.ts

@@ -24,9 +24,6 @@ interface AppState {
   setDockerAvailable: (available: boolean | null) => void;
   imageExists: boolean | null;
   setImageExists: (exists: boolean | null) => void;
-  hasKey: boolean | null;
-  setHasKey: (has: boolean | null) => void;
-
   // App settings
   appSettings: AppSettings | null;
   setAppSettings: (settings: AppSettings) => void;
@@ -85,9 +82,6 @@ export const useAppState = create<AppState>((set) => ({
   setDockerAvailable: (available) => set({ dockerAvailable: available }),
   imageExists: null,
   setImageExists: (exists) => set({ imageExists: exists }),
-  hasKey: null,
-  setHasKey: (has) => set({ hasKey: has }),
-
   // App settings
   appSettings: null,
   setAppSettings: (settings) => set({ appSettings: settings }),