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

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

apps/backend/scripts/migration/test-create-post.ts

@@ -0,0 +1,49 @@
+#!/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)
+// Script is at: apps/backend/scripts/migration/test-create-post.ts
+// .env is at: apps/backend/.env
+const envPath = resolve(__dirname, '../../.env')
+
+dotenvConfig({ path: envPath })
+
+// Verify env is loaded
+console.log('PAYLOAD_SECRET loaded:', !!process.env.PAYLOAD_SECRET)
+console.log('PAYLOAD_SECRET value:', process.env.PAYLOAD_SECRET?.substring(0, 10))
+
+// Dynamic import after dotenv to ensure env is loaded before config
+const { getPayload } = await import('payload')
+const config = await import('../../src/payload.config.ts')
+const { parseWebflowCSV } = await import('./csvParser.ts')
+const { transformPosts } = await import('./transformers.ts')
+
+async function main() {
+  const payload = await getPayload({ config })
+
+  const data = await parseWebflowCSV('/Users/pukpuk/Dev/website-enchun-mgr/恩群數位行銷 - 行銷放大鏡集.csv')
+  const failPost = data.posts.find((p: any) => p.title.includes('一點都不難'))
+  const transformed = transformPosts([failPost])[0]
+
+  console.log('Attempting to create:', transformed.title)
+  console.log('Slug:', transformed.slug)
+
+  try {
+    const result = await payload.create({
+      collection: 'posts',
+      data: transformed,
+    })
+    console.log('Success! Created:', result.id)
+  } catch (error: any) {
+    console.log('Failed!')
+    console.log('Error message:', error.message)
+    if (error.data) {
+      console.log('Error data:', JSON.stringify(error.data, null, 2))
+    }
+  }
+}
+
+main().catch(console.error)