Update project structure and enhance frontend functionality

- Added a new AGENTS.md file to document the project structure and conventions.
- Updated .gitignore to include node_modules and refined cursor rules.
- Introduced new backend and frontend components for improved map interactions, including context menus and controls.
- Enhanced API composables for better admin and authentication functionalities.
- Refactored existing components for cleaner code and improved user experience.
- Updated README.md to clarify production asset serving and user setup instructions.

frontend-nuxt/components/map/MapCoordsDisplay.vue

@@ -0,0 +1,17 @@
+<template>
+  <div
+    v-if="displayCoords"
+    class="absolute bottom-2 right-2 z-[501] rounded-lg px-3 py-2 font-mono text-sm bg-base-100/95 backdrop-blur-sm border border-base-300/50 shadow"
+    aria-label="Current grid position and zoom"
+    title="mapId · x, y · zoom"
+  >
+    {{ mapid }} · {{ displayCoords.x }}, {{ displayCoords.y }} · z{{ displayCoords.z }}
+  </div>
+</template>
+
+<script setup lang="ts">
+defineProps<{
+  mapid: number
+  displayCoords: { x: number; y: number; z: number } | null
+}>()
+</script>