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

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

apps/backend/scripts/migration/analyze-failures.ts

@@ -0,0 +1,59 @@
+#!/usr/bin/env tsx
+import { config as dotenvConfig } from 'dotenv'
+import { resolve, dirname } from 'path'
+import { fileURLToPath } from 'url'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = dirname(__filename)
+const envPath = resolve(__dirname, '../../.env')
+
+dotenvConfig({ path: envPath })
+
+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('HTML content length:', successPost.content?.length)
+
+  const successLexical = htmlToLexical(successPost.content || '')
+  console.log('Lexical JSON length:', successLexical.length)
+  const successParsed = JSON.parse(successLexical)
+  console.log('Lexical children count:', successParsed.root?.children?.length)
+
+  console.log('\n=== FAILED POST ===')
+  console.log('Title:', failPost.title)
+  console.log('HTML content length:', failPost.content?.length)
+
+  const failLexical = htmlToLexical(failPost.content || '')
+  console.log('Lexical JSON length:', failLexical.length)
+  const failParsed = JSON.parse(failLexical)
+  console.log('Lexical children count:', failParsed.root?.children?.length)
+
+  // Check for special characters in HTML
+  console.log('\n=== CHARACTER CHECK ===')
+  const specialChars = /["\n\r\t]/
+  const failMatches = (failPost.content?.match(specialChars) || []).length
+  const successMatches = (successPost.content?.match(specialChars) || []).length
+  console.log('Special chars in fail post:', failMatches)
+  console.log('Special chars in success post:', successMatches)
+
+  // Look for empty text nodes
+  let emptyTextCount = 0
+  failParsed.root?.children?.forEach((child: any) => {
+    child.children?.forEach((grandchild: any) => {
+      if (grandchild.type === 'text' && grandchild.text === '') {
+        emptyTextCount++
+      }
+    })
+  })
+  console.log('Empty text nodes in fail post:', emptyTextCount)
+}
+
+main().catch(console.error)