Complete editable fields whitelists for all remaining AE objects

- Created .editable_fields.ts files for Journals, Events, and Sponsorships modules
- Standardized the whitelist pattern across the entire codebase
- Updated TODO.md and GEMINI.md with recent accomplishments and learnings

src/lib/ae_events/ae_events__event_location.editable_fields.ts

@@ -0,0 +1,18 @@
+export const editable_fields__event_location = [
+    'external_id',
+    'code',
+    'type_code',
+    'name',
+    'description',
+    'passcode',
+    'hide_event_launcher',
+    'alert',
+    'alert_msg',
+    'data_json',
+    'enable',
+    'hide',
+    'priority',
+    'sort',
+    'group',
+    'notes'
+];