feat(server): implement doc service (#9961)

close CLOUD-94

.github/helm/affine/values.yaml

@@ -39,6 +39,8 @@ global:
       secretAccessKey: ''
   gke:
     enabled: true
+  docService:
+    endpoint: 'http://affine-doc:3020'
 
 graphql:
   service:
@@ -61,6 +63,13 @@ renderer:
     annotations:
       cloud.google.com/backend-config: '{"default": "affine-api-backendconfig"}'
 
+doc:
+  service:
+    type: ClusterIP
+    port: 3020
+    annotations:
+      cloud.google.com/backend-config: '{"default": "affine-api-backendconfig"}'
+
 web:
   service:
     type: ClusterIP