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

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

apps/backend/scripts/migration/fix-content.ts

@@ -0,0 +1,62 @@
+#!/usr/bin/env tsx
+/**
+ * Fix Post Content Format
+ *
+ * Converts post content from object to JSON string format
+ * for Payload CMS richText field compatibility
+ */
+
+import { config as dotenvConfig } from 'dotenv'
+dotenvConfig({ path: '.env' })
+
+import { getPayload } from 'payload'
+import config from '../../src/payload.config'
+
+async function main() {
+  const payload = await getPayload({ config })
+
+  console.log('🔧 Fixing post content format...')
+
+  const posts = await payload.find({
+    collection: 'posts',
+    limit: 100,
+    depth: 0,
+  })
+
+  console.log(`Found ${posts.totalDocs} posts to check`)
+
+  let fixed = 0
+  let skipped = 0
+
+  for (const post of posts.docs) {
+    // Check if content is an object (needs fixing)
+    if (post.content && typeof post.content === 'object') {
+      const id = post.id
+      const title = post.title?.substring(0, 40) + '...'
+
+      // Convert to JSON string
+      const contentJson = JSON.stringify(post.content)
+
+      try {
+        await payload.update({
+          collection: 'posts',
+          id,
+          data: {
+            content: contentJson,
+          },
+        })
+        console.log(`✓ Fixed: ${title}`)
+        fixed++
+      } catch (error) {
+        console.error(`✗ Failed to fix ${title}:`, error)
+      }
+    } else {
+      skipped++
+    }
+  }
+
+  console.log(`\n✅ Fixed ${fixed} posts`)
+  console.log(`⏭️ Skipped ${skipped} posts (already in correct format)`)
+}
+
+main().catch(console.error)