feat: Introduce TimerKey enum and refactor timer key usage across services with new tests.

shared/lib/constants.ts

@@ -10,6 +10,12 @@ export enum TimerType {
     TRIVIA_COOLDOWN = 'TRIVIA_COOLDOWN',
 }
 
+export enum TimerKey {
+    CHAT_XP = 'chat_xp',
+    DAILY = 'daily',
+    WEEKLY = 'weekly',
+}
+
 export enum EffectType {
     ADD_XP = 'ADD_XP',
     ADD_BALANCE = 'ADD_BALANCE',