Enhance protocol and simulation features with activity tracking and behavior definitions

- Updated protocol documentation to include new `activity` and `activityLabel` fields in the person card response, reflecting real-time activity status.
- Introduced `BehaviorDef` to define behavior rules, including need thresholds and lesson skill gains, enhancing AI decision-making.
- Revised the `DefCatalog` to incorporate behavior definitions and updated validation logic to ensure proper behavior handling.
- Enhanced the simulation to manage presence and activity states, allowing for more dynamic interactions within the school environment.
- Updated tests to validate the new activity tracking and behavior functionalities, ensuring robust performance and reliability.
- Improved localization strings to support new activity and behavior features, enhancing user experience.

docs/protocol.md

@@ -218,6 +218,9 @@ and partners for a parent. The client opens another card by id; this response do
 cards. `classId` is the homeroom class for a pupil and `null` otherwise — the personal timetable
 grid fetches `GET .../timetable?classId=` with it.
 
+`activity` is the ActionDef name currently in progress, or `null` when idle. `activityLabel`
+is that def in the request locale. HTTP JSON is additive — no protocol version bump.
+
 ```json
 {
   "id": "f0.c0",
@@ -233,6 +236,8 @@ grid fetches `GET .../timetable?classId=` with it.
   "skills": [{ "id": "Math", "label": "Математика", "value": "62" }],
   "traits": [{ "defName": "Diligent", "label": "Усидчивый" }],
   "needs": [{ "id": "Sleep", "label": "Сон", "value": 1 }],
+  "activity": null,
+  "activityLabel": null,
   "family": {
     "parents": [{ "id": "f0.p1", "fullName": "Иванова Ольга Михайловна", "female": true }],
     "children": [],