feat: provider key management from Settings — v0.50.159 (PR #867 by @bergeouss, closes #586)

New Providers tab in Settings lets users add/update/remove API keys without editing .env. Six review fixes applied. 18 tests.

static/i18n.js

@@ -276,6 +276,26 @@ const LOCALES = {
     password_placeholder: 'Enter new password…',
     disable_auth: 'Disable Auth',
     sign_out: 'Sign Out',
+    // Providers panel
+    providers_tab_title: 'Providers',
+    providers_section_title: 'Providers',
+    providers_section_meta: 'Manage API keys for AI providers. Changes take effect immediately.',
+    providers_status_configured: 'API key configured',
+    providers_status_not_configured: 'No API key',
+    providers_status_oauth: 'OAuth',
+    providers_status_api_key: 'API key',
+    providers_status_not_configured_label: 'Not configured',
+    providers_oauth_hint: 'Authenticated via OAuth. No API key needed.',
+    providers_save: 'Save',
+    providers_remove: 'Remove',
+    providers_saving: 'Saving…',
+    providers_removing: 'Removing…',
+    providers_enter_key: 'Please enter an API key',
+    providers_empty: 'No configurable providers found.',
+    providers_key_updated: 'API key saved',
+    providers_key_removed: 'API key removed',
+    providers_key_placeholder_new: 'sk-...',
+    providers_key_placeholder_replace: 'Enter new key to replace…',
     cancel: 'Cancel',
     create_job: 'Create job',
     save_skill: 'Save skill',