Added cache busting option for devs

ui/src/pages/DeveloperTools.vue

@@ -0,0 +1,52 @@
+<script setup lang="ts">
+import Button from '@/components/ui/button/Button.vue';
+import { bustUserCache } from '@/api/member';
+import type { UserCacheBustResult } from '@shared/types/member';
+import { ref } from 'vue';
+
+const loading = ref(false);
+const result = ref<UserCacheBustResult | null>(null);
+const error = ref<string | null>(null);
+
+async function onBustUserCache() {
+    loading.value = true;
+    error.value = null;
+
+    try {
+        result.value = await bustUserCache();
+    } catch (err) {
+        result.value = null;
+        error.value = err instanceof Error ? err.message : 'Failed to bust user cache';
+    } finally {
+        loading.value = false;
+    }
+}
+</script>
+
+<template>
+    <div class="max-w-3xl mx-auto pt-10 px-4">
+        <h1 class="scroll-m-20 text-2xl font-semibold tracking-tight">Developer Tools</h1>
+        <p class="mt-2 text-sm text-muted-foreground">
+            Use this page to recover from stale in-memory authentication data after manual database changes.
+        </p>
+
+        <div class="mt-6 rounded-lg border p-5 bg-card">
+            <p class="font-medium">Server User Cache</p>
+            <p class="text-sm text-muted-foreground mt-1">
+                This clears the API server's cached user session data so the next request reloads from the database.
+            </p>
+
+            <div class="mt-4 flex items-center gap-3">
+                <Button :disabled="loading" @click="onBustUserCache">
+                    {{ loading ? 'Busting Cache...' : 'Bust User Cache' }}
+                </Button>
+            </div>
+
+            <p v-if="result" class="mt-4 text-sm text-green-700">
+                Cache busted successfully. Cleared {{ result.clearedEntries }} entr{{ result.clearedEntries === 1 ? 'y' : 'ies' }} at
+                {{ new Date(result.bustedAt).toLocaleString() }}.
+            </p>
+            <p v-if="error" class="mt-4 text-sm text-red-700">{{ error }}</p>
+        </div>
+    </div>
+</template>