feat(threads): add real-time forum and chat system

Implement DB schema, API, and WebSocket for channels and messages
Add frontend views, AI moderation, and admin management

frontend/pages/threads/[id].vue

@@ -0,0 +1,11 @@
+<script setup lang="ts">
+import ThreadsView from '../../src/views/ThreadsView.vue';
+
+definePageMeta({
+  title: 'Threads'
+});
+</script>
+
+<template>
+  <ThreadsView />
+</template>