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

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

apps/backend/pnpm-lock.yaml

@@ -150,6 +150,9 @@ importers:
       eslint-config-next:
         specifier: 15.4.4
         version: 15.4.4(eslint@9.37.0(jiti@1.21.7))(typescript@5.7.3)
+      html-parse-stringify:
+        specifier: ^3.0.1
+        version: 3.0.1
       jsdom:
         specifier: 26.1.0
         version: 26.1.0
@@ -3387,6 +3390,9 @@ packages:
     resolution: {integrity: sha512-Y22oTqIU4uuPgEemfz7NDJz6OeKf12Lsu+QC+s3BVpda64lTiMYCyGwg5ki4vFxkMwQdeZDl2adZoqUgdFuTgQ==}
     engines: {node: '>=18'}
 
+  html-parse-stringify@3.0.1:
+    resolution: {integrity: sha512-KknJ50kTInJ7qIScF3jeaFRpMpE8/lfiTdzf/twXyPBLAGrLRTmkz3AdTnKeh40X8k9L2fdYwEp/42WGXIRGcg==}
+
   http-proxy-agent@7.0.2:
     resolution: {integrity: sha512-T1gkAiYYDWYx3V5Bmyu7HcfcvL7mUrTWiM6yOfa3PIphViJ/gFPbvidQ+veqSOHci/PxBcDabeUNCzpOODJZig==}
     engines: {node: '>= 14'}
@@ -5055,6 +5061,10 @@ packages:
       jsdom:
         optional: true
 
+  void-elements@3.1.0:
+    resolution: {integrity: sha512-Dhxzh5HZuiHQhbvTW9AMetFfBHDMYpo23Uo9btPXgdYP+3T5S+p+jgNy7spra+veYhBP2dCSgxR/i2Y02h5/6w==}
+    engines: {node: '>=0.10.0'}
+
   w3c-xmlserializer@5.0.0:
     resolution: {integrity: sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==}
     engines: {node: '>=18'}
@@ -9065,6 +9075,10 @@ snapshots:
     dependencies:
       whatwg-encoding: 3.1.1
 
+  html-parse-stringify@3.0.1:
+    dependencies:
+      void-elements: 3.1.0
+
   http-proxy-agent@7.0.2:
     dependencies:
       agent-base: 7.1.4
@@ -11057,6 +11071,8 @@ snapshots:
       - tsx
       - yaml
 
+  void-elements@3.1.0: {}
+
   w3c-xmlserializer@5.0.0:
     dependencies:
       xml-name-validator: 5.0.0