feat: refactor agent manager, media library, and player UX

- Split admin users page into player/tier-1/tier-2 tabs with affiliation labels and context-specific create dialogs

- Add media library with uploaded_files migration, list/delete unused files API, and admin nav route

- Enforce player username format (alphanumeric 3-32) on frontend and backend via shared package

- Improve admin dialog/panel styling; refine player parlay and match bet card kickoff display

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/player/src/components/BetHistoryCard.vue

@@ -67,6 +67,8 @@ const subtitle = computed(() => {
   return props.bet.pickLabel || props.bet.leagueName || '';
 });
 
+const stakeAmount = computed(() => formatMoney(props.bet.stake, locale.value));
+
 const returnAmount = computed(() => {
   if (statusKey.value === 'won') return formatMoney(props.bet.actualReturn, locale.value);
   if (statusKey.value === 'pending') return formatMoney(props.bet.potentialReturn, locale.value);
@@ -94,6 +96,9 @@ function goDetail() {
       <span class="subtitle">{{ subtitle }} · {{ placedDate }}</span>
     </div>
     <div class="card-right">
+      <span class="stake-amt">
+        {{ t('history.stake') }} {{ stakeAmount }}
+      </span>
       <span class="return-amt" :class="{ highlight: returnHighlight, pending: returnPending, lost: returnLost }">
         {{ returnAmount }}
       </span>
@@ -176,6 +181,12 @@ function goDetail() {
   gap: 4px;
 }
 
+.stake-amt {
+  font-size: 11px;
+  color: #666;
+  font-weight: 600;
+}
+
 .return-amt {
   font-size: 15px;
   font-weight: 900;