feat: enhance duty information handling with contact details and current duty view

- Added `bot_username` to settings for dynamic retrieval of the bot's username.
- Implemented `_resolve_bot_username` function to fetch the bot's username if not set, improving user experience in group chats.
- Updated `DutyWithUser` schema to include optional `phone` and `username` fields for enhanced duty information.
- Enhanced API responses to include contact details for users, ensuring better communication.
- Introduced a new current duty view in the web app, displaying active duty information along with contact options.
- Updated CSS styles for better presentation of contact information in duty cards.
- Added unit tests to verify the inclusion of contact details in API responses and the functionality of the current duty view.

webapp/js/i18n.js

@@ -49,7 +49,16 @@ export const MESSAGES = {
     "hint.to": "until",
     "hint.duty_title": "Duty:",
     "hint.events": "Events:",
-    "day_detail.close": "Close"
+    "day_detail.close": "Close",
+    "contact.label": "Contact",
+    "contact.show": "Contacts",
+    "contact.back": "Back",
+    "contact.phone": "Phone",
+    "contact.telegram": "Telegram",
+    "current_duty.title": "Current Duty",
+    "current_duty.no_duty": "No one is on duty right now",
+    "current_duty.shift": "Shift",
+    "current_duty.back": "Back to calendar"
   },
   ru: {
     "app.title": "Календарь дежурств",
@@ -94,7 +103,16 @@ export const MESSAGES = {
     "hint.to": "до",
     "hint.duty_title": "Дежурство:",
     "hint.events": "События:",
-    "day_detail.close": "Закрыть"
+    "day_detail.close": "Закрыть",
+    "contact.label": "Контакт",
+    "contact.show": "Контакты",
+    "contact.back": "Назад",
+    "contact.phone": "Телефон",
+    "contact.telegram": "Telegram",
+    "current_duty.title": "Текущее дежурство",
+    "current_duty.no_duty": "Сейчас никто не дежурит",
+    "current_duty.shift": "Смена",
+    "current_duty.back": "Назад к календарю"
   }
 };