feat(server): add image resize support (#14588)

fix #13842 


#### PR Dependency Tree


* **PR #14588** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Images are now processed natively and converted to WebP for smaller,
optimized files; Copilot and avatar attachments use the processed WebP
output.
* Avatar uploads accept BMP, GIF, JPEG, PNG, WebP (5MB max) and are
downscaled to a standard edge.

* **Error Messages / i18n**
  * Added localized error "Image format not supported: {format}".

* **Tests**
* Added end-to-end and unit tests for conversion, EXIF preservation, and
upload limits.

* **Chores**
  * Added native image-processing dependencies.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/common/graphql/src/schema.ts

@@ -1056,6 +1056,7 @@ export type ErrorDataUnion =
   | ExpectToUpdateDocUserRoleDataType
   | GraphqlBadRequestDataType
   | HttpRequestErrorDataType
+  | ImageFormatNotSupportedDataType
   | InvalidAppConfigDataType
   | InvalidAppConfigInputDataType
   | InvalidEmailDataType
@@ -1162,6 +1163,7 @@ export enum ErrorNames {
   FAILED_TO_UPSERT_SNAPSHOT = 'FAILED_TO_UPSERT_SNAPSHOT',
   GRAPHQL_BAD_REQUEST = 'GRAPHQL_BAD_REQUEST',
   HTTP_REQUEST_ERROR = 'HTTP_REQUEST_ERROR',
+  IMAGE_FORMAT_NOT_SUPPORTED = 'IMAGE_FORMAT_NOT_SUPPORTED',
   INTERNAL_SERVER_ERROR = 'INTERNAL_SERVER_ERROR',
   INVALID_APP_CONFIG = 'INVALID_APP_CONFIG',
   INVALID_APP_CONFIG_INPUT = 'INVALID_APP_CONFIG_INPUT',
@@ -1314,6 +1316,11 @@ export interface HttpRequestErrorDataType {
   message: Scalars['String']['output'];
 }
 
+export interface ImageFormatNotSupportedDataType {
+  __typename?: 'ImageFormatNotSupportedDataType';
+  format: Scalars['String']['output'];
+}
+
 export interface ImportUsersInput {
   users: Array<CreateUserInput>;
 }