feat: install Flysystem S3 and configure SeaweedFS storage

Add league/flysystem-bundle and league/flysystem-aws-s3-v3 packages and
configure the default.storage adapter to use AWS S3Client pointed at the
SeaweedFS endpoint (s3.lclr.dev) with path-style endpoints and secret-based
credentials.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

config/bundles.php

@@ -15,4 +15,5 @@ return [
     Symfony\Bundle\MakerBundle\MakerBundle::class => ['dev' => true],
     Symfony\UX\React\ReactBundle::class => ['all' => true],
     Pentatrion\ViteBundle\PentatrionViteBundle::class => ['all' => true],
+    League\FlysystemBundle\FlysystemBundle::class => ['all' => true],
 ];

config/packages/flysystem.yaml

@@ -0,0 +1,19 @@
+flysystem:
+    storages:
+        default.storage:
+            adapter: 'aws'
+            options:
+                client: 's3_client'
+                bucket: 'ltbxd-actorle'
+
+services:
+    s3_client:
+        class: Aws\S3\S3Client
+        arguments:
+            -   endpoint: 'https://s3.lclr.dev'
+                credentials:
+                    key: '%env(secret:S3_ACCESS_KEY)%'
+                    secret: '%env(secret:S3_SECRET_KEY)%'
+                region: 'us-east-1'
+                version: 'latest'
+                use_path_style_endpoint: true

config/reference.php

@@ -1487,6 +1487,22 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  *         preload_attributes?: list<scalar|null|Param>,
  *     }>,
  * }
+ * @psalm-type FlysystemConfig = array{
+ *     storages?: array<string, array{ // Default: []
+ *         adapter: scalar|null|Param,
+ *         options?: list<mixed>,
+ *         visibility?: scalar|null|Param, // Default: null
+ *         directory_visibility?: scalar|null|Param, // Default: null
+ *         retain_visibility?: bool|null|Param, // Default: null
+ *         case_sensitive?: bool|Param, // Default: true
+ *         disable_asserts?: bool|Param, // Default: false
+ *         public_url?: list<scalar|null|Param>,
+ *         path_normalizer?: scalar|null|Param, // Default: null
+ *         public_url_generator?: scalar|null|Param, // Default: null
+ *         temporary_url_generator?: scalar|null|Param, // Default: null
+ *         read_only?: bool|Param, // Default: false
+ *     }>,
+ * }
  * @psalm-type ConfigType = array{
  *     imports?: ImportsConfig,
  *     parameters?: ParametersConfig,
@@ -1502,6 +1518,7 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  *     monolog?: MonologConfig,
  *     react?: ReactConfig,
  *     pentatrion_vite?: PentatrionViteConfig,
+ *     flysystem?: FlysystemConfig,
  *     "when@dev"?: array{
  *         imports?: ImportsConfig,
  *         parameters?: ParametersConfig,
@@ -1520,6 +1537,7 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  *         maker?: MakerConfig,
  *         react?: ReactConfig,
  *         pentatrion_vite?: PentatrionViteConfig,
+ *         flysystem?: FlysystemConfig,
  *     },
  *     "when@prod"?: array{
  *         imports?: ImportsConfig,
@@ -1536,6 +1554,7 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  *         monolog?: MonologConfig,
  *         react?: ReactConfig,
  *         pentatrion_vite?: PentatrionViteConfig,
+ *         flysystem?: FlysystemConfig,
  *     },
  *     "when@test"?: array{
  *         imports?: ImportsConfig,
@@ -1553,6 +1572,7 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  *         monolog?: MonologConfig,
  *         react?: ReactConfig,
  *         pentatrion_vite?: PentatrionViteConfig,
+ *         flysystem?: FlysystemConfig,
  *     },
  *     ...<string, ExtensionType|array{ // extra keys must follow the when@%env% pattern or match an extension alias
  *         imports?: ImportsConfig,