feat: configurable trip reminders, admin full access, and enhanced audit logging

- Add configurable trip reminder days (1, 3, 9 or custom up to 30) settable by trip owner
- Grant administrators full access to edit, archive, delete, view and list all trips
- Show trip owner email in audit logs and docker logs when admin edits/deletes another user's trip
- Show target user email in audit logs when admin edits or deletes a user account
- Use email instead of username in all notifications (Discord/Slack/email) to avoid ambiguity
- Grey out notification event toggles when no SMTP/webhook is configured
- Grey out trip reminder selector when notifications are disabled
- Skip local admin account creation when OIDC_ONLY=true with OIDC configured
- Conditional scheduler logging: show disabled reason or active reminder count
- Log per-owner reminder creation/update in docker logs
- Demote 401/403 HTTP errors to DEBUG log level to reduce noise
- Hide edit/archive/delete buttons for non-owner invited users on trip cards
- Fix literal "0" rendering on trip cards from SQLite numeric is_owner field
- Add missing translation keys across all 14 language files

Made-with: Cursor

client/src/App.tsx

@@ -71,18 +71,19 @@ function RootRedirect() {
 }
 
 export default function App() {
-  const { loadUser, token, isAuthenticated, demoMode, setDemoMode, setHasMapsKey, setServerTimezone, setAppRequireMfa } = useAuthStore()
+  const { loadUser, token, isAuthenticated, demoMode, setDemoMode, setHasMapsKey, setServerTimezone, setAppRequireMfa, setTripRemindersEnabled } = useAuthStore()
   const { loadSettings } = useSettingsStore()
 
   useEffect(() => {
     if (token) {
       loadUser()
     }
-    authApi.getAppConfig().then(async (config: { demo_mode?: boolean; has_maps_key?: boolean; version?: string; timezone?: string; require_mfa?: boolean }) => {
+    authApi.getAppConfig().then(async (config: { demo_mode?: boolean; has_maps_key?: boolean; version?: string; timezone?: string; require_mfa?: boolean; trip_reminders_enabled?: boolean }) => {
       if (config?.demo_mode) setDemoMode(true)
       if (config?.has_maps_key !== undefined) setHasMapsKey(config.has_maps_key)
       if (config?.timezone) setServerTimezone(config.timezone)
       if (config?.require_mfa !== undefined) setAppRequireMfa(!!config.require_mfa)
+      if (config?.trip_reminders_enabled !== undefined) setTripRemindersEnabled(config.trip_reminders_enabled)
 
       if (config?.version) {
         const storedVersion = localStorage.getItem('trek_app_version')