refactor(core): consolidate logic and modernize imports

- Unified Person and User logic into ae_core__* counterparts and marked legacy files.
- Renamed Activity Log to ae_core__activity_log.ts for naming consistency.
- Updated all core function imports across the identity, logs, and video conference modules.
- Fixed missing 'prefix' field in Person form payload and corrected return types in Activity Log.
- Updated project TODO to reflect completed core module refinements.

src/routes/core/activity_logs/+page.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
     /** @type {import('./$types').PageData} */
     import { onMount } from 'svelte';
-    import { qry__activity_log } from '$lib/ae_core/core__activity_log';
+    import { qry__activity_log } from '$lib/ae_core/ae_core__activity_log';
     import { ae_api, ae_loc } from '$lib/stores/ae_stores';
     import { Search, History, Calendar, User, Tag, Activity } from 'lucide-svelte';
     import { ae_util } from '$lib/ae_utils/ae_utils';