refactor(lifecycle hooks): simplify integration of new services

* make more coherent lifecycles
  * remove specific implementation on different handlers (they do not need to know existence of ThumbnailSerice nor AudioMetadataService)
  * reduce risk of orphean objects
  * ensure additional services are correctly wired (ex: Thumbnail generation was not covering all upload cases)
  * more details on docs/architecture/file-and-blob-lifecycle.md :

```rust
// application/ports/file_lifecycle.rs
pub trait FileLifecycleHook {

    fn on_file_created(file_id, blob_hash, content_type, is_new_blob);
    fn on_file_updated(file_id, blob_hash, content_type);
    fn on_file_copied(file_id, blob_hash, content_type, source_id)
    fn on_file_deleted(file_id);
}

// application/ports/blob_lifecycle.rs
pub trait BlobLifecycleHook {

    fn on_blob_created(blob_hash, content_type);
    fn on_blob_deleted(blob_hash);
}
```

src/interfaces/nextcloud/uploads_handler.rs

@@ -8,7 +8,6 @@ use std::sync::Arc;
 use crate::application::ports::file_ports::{FileRetrievalUseCase, FileUploadUseCase};
 use crate::common::di::AppState;
 use crate::common::mime_detect::{filename_from_path, refine_content_type_from_file};
-use crate::infrastructure::services::audio_metadata_service::AudioMetadataService;
 use crate::interfaces::errors::AppError;
 use crate::interfaces::middleware::auth::{AuthUser, CurrentUser};
 
@@ -187,19 +186,6 @@ async fn handle_assemble(
             .await
             .map_err(|e| AppError::internal_error(format!("Failed to create file: {}", e)))?;
 
-        // Extract audio metadata for supported audio files in background.
-        if let Some(ref audio_service) = state.applications.audio_metadata_service
-            && AudioMetadataService::is_audio_file(&dto.mime_type)
-            && let Ok(file_id) = uuid::Uuid::parse_str(&dto.id)
-        {
-            let file_path = state.core.dedup_service.blob_path(&dto.etag);
-            AudioMetadataService::spawn_extraction_background(
-                audio_service.clone(),
-                file_id,
-                file_path,
-            );
-        }
-
         Some(dto.etag)
     };