Implement HTTP timeout configurations and enhance API documentation

- Added optional HTTP server timeout configurations (`HNHMAP_READ_TIMEOUT`, `HNHMAP_WRITE_TIMEOUT`, `HNHMAP_IDLE_TIMEOUT`) to `.env.example` and updated the server initialization in `main.go` to utilize these settings.
- Enhanced API documentation for the `rebuildZooms` endpoint to clarify its background processing and polling mechanism for status updates.
- Updated `configuration.md` to include new timeout environment variables for better configuration guidance.
- Improved error handling in the client for large request bodies, ensuring appropriate responses for oversized payloads.

frontend-nuxt/pages/admin/index.vue

@@ -60,11 +60,11 @@
             aria-label="Search users"
           />
         </div>
-          <div class="flex flex-col gap-2">
+          <div class="flex flex-col gap-2 max-h-[60vh] overflow-y-auto">
             <div
               v-for="u in filteredUsers"
               :key="u"
-              class="flex items-center justify-between gap-3 w-full p-3 rounded-lg bg-base-300/50 hover:bg-base-300/70 transition-colors"
+              class="flex items-center justify-between gap-3 w-full p-3 rounded-lg bg-base-300/50 hover:bg-base-300/70 transition-colors shrink-0"
             >
               <div class="flex items-center gap-2 min-w-0">
                 <div class="avatar avatar-placeholder">
@@ -103,7 +103,7 @@
             aria-label="Search maps"
           />
         </div>
-          <div class="overflow-x-auto">
+          <div class="overflow-x-auto max-h-[60vh] overflow-y-auto">
             <table class="table table-sm table-zebra min-w-[32rem]">
               <thead>
                 <tr>
@@ -199,7 +199,7 @@
         </h2>
           <div class="flex flex-col gap-3">
             <div>
-              <a :href="api.adminExportUrl()" target="_blank" rel="noopener" class="btn btn-sm min-h-11 touch-manipulation">
+              <a :href="exportUrl" target="_blank" rel="noopener" class="btn btn-sm min-h-11 touch-manipulation">
                 Export zip
               </a>
             </div>
@@ -284,6 +284,7 @@ definePageMeta({ middleware: 'admin' })
 useHead({ title: 'Admin – HnH Map' })
 
 const api = useMapApi()
+const exportUrl = computed(() => api.adminExportUrl())
 const toast = useToast()
 const users = ref<string[]>([])
 const maps = ref<MapInfoAdmin[]>([])
@@ -391,6 +392,15 @@ async function doRebuildZooms() {
   rebuilding.value = true
   try {
     await api.adminRebuildZooms()
+    // Rebuild runs in background; poll status until done
+    const poll = async (): Promise<void> => {
+      const { running } = await api.adminRebuildZoomsStatus()
+      if (running) {
+        await new Promise((r) => setTimeout(r, 2000))
+        return poll()
+      }
+    }
+    await poll()
     markRebuildDone()
     showRebuildModal.value = false
     toast.success('Zooms rebuilt.')