feat(backend): update collections, config and migration tools

Update Payload CMS configuration, collections (Audit, Posts), and add migration scripts/reports.

apps/backend/scripts/migration/compare-posts.ts

@@ -0,0 +1,40 @@
+#!/usr/bin/env tsx
+import { config as dotenvConfig } from 'dotenv'
+dotenvConfig({ path: '.env' })
+
+import { parseWebflowCSV } from './csvParser'
+import { htmlToLexical } from './lexicalConverter'
+
+async function main() {
+  const data = await parseWebflowCSV('/Users/pukpuk/Dev/website-enchun-mgr/恩群數位行銷 - 行銷放大鏡集.csv')
+
+  const successPost = data.posts.find((p: any) => p.title === '正確的 hashtag 帶你上天堂')
+  const failPost = data.posts.find((p: any) => p.title.includes('一點都不難'))
+
+  console.log('=== SUCCESSFUL POST ===')
+  console.log('Title:', successPost.title)
+  console.log('Content length:', successPost.content?.length)
+
+  const successLexical = htmlToLexical(successPost.content || '')
+  const successParsed = JSON.parse(successLexical)
+  console.log('Has root:', successParsed.root !== undefined)
+  console.log('Root type:', successParsed.root?.type)
+  console.log('Root children count:', successParsed.root?.children?.length)
+
+  console.log('\n=== FAILED POST ===')
+  console.log('Title:', failPost.title)
+  console.log('Content length:', failPost.content?.length)
+
+  const failLexical = htmlToLexical(failPost.content || '')
+  const failParsed = JSON.parse(failLexical)
+  console.log('Has root:', failParsed.root !== undefined)
+  console.log('Root type:', failParsed.root?.type)
+  console.log('Root children count:', failParsed.root?.children?.length)
+
+  // Check for any differences in structure
+  console.log('\n=== STRUCTURE COMPARISON ===')
+  console.log('Success first child type:', successParsed.root?.children?.[0]?.type)
+  console.log('Fail first child type:', failParsed.root?.children?.[0]?.type)
+}
+
+main().catch(console.error)