feat(content_hash): propagate etag and hash_content to */resources

src/application/dtos/favorites_dto.rs

@@ -125,6 +125,10 @@ pub struct FavoriteResourceRow {
     pub resource_created_at: DateTime<Utc>,
     pub modified_at: DateTime<Utc>,
     pub owner_id: Uuid,
+    /// Raw BLAKE3 content hash. `Some(_)` for file rows, `None` for
+    /// folder rows. Routes into `FileDto::content_hash` and feeds
+    /// `File::compute_etag` to populate `FileDto::etag`.
+    pub blob_hash: Option<String>,
     /// `true` when `owner_id == requesting user_id`.
     pub is_owner: bool,
     pub favorited_at: DateTime<Utc>,

src/application/dtos/folder_dto.rs

@@ -181,6 +181,11 @@ pub struct FolderResourceRow {
     pub created_at: DateTime<Utc>,
     pub modified_at: DateTime<Utc>,
     pub owner_id: Uuid,
+    /// Raw BLAKE3 content hash. `Some(_)` for file rows, `None` for
+    /// folder rows. Populates `FileDto::content_hash` + `FileDto::etag`
+    /// on the REST `/api/folders/{id}/resources` listing so API
+    /// consumers can issue conditional requests against listed files.
+    pub blob_hash: Option<String>,
     // Pre-computed sort fields — returned by the SQL for cursor construction.
     /// `LOWER(name)` used by `name`/`type` sorts.
     pub sort_str: String,

src/application/dtos/recent_dto.rs

@@ -105,6 +105,10 @@ pub struct RecentResourceRow {
     pub resource_created_at: DateTime<Utc>,
     pub modified_at: DateTime<Utc>,
     pub owner_id: Uuid,
+    /// Raw BLAKE3 content hash. `Some(_)` for file rows, `None` for
+    /// folder rows. Feeds `File::compute_etag` so this listing's
+    /// `etag` matches GET/HEAD/PROPFIND for the same file.
+    pub blob_hash: Option<String>,
     /// `true` when `owner_id == requesting user_id`.
     pub is_owner: bool,
     pub accessed_at: DateTime<Utc>,

src/application/dtos/search_dto.rs

@@ -127,6 +127,13 @@ pub struct SearchFileResultDto {
     pub icon_special_class: String,
     /// Content category: "document", "image", "video", "audio", "archive", "code", "other"
     pub category: String,
+    /// Raw BLAKE3 content hash. Feeds `FileDto::content_hash` and
+    /// `File::compute_etag` when search results are converted to
+    /// `FileDto` (NC REPORT/SEARCH response). Defaults to `String::new()`
+    /// for backward-compatible deserialisation of cached results
+    /// that pre-date the column.
+    #[serde(default)]
+    pub blob_hash: String,
 }
 
 /// A folder search result enriched with server-computed metadata

src/application/dtos/trash_dto.rs

@@ -61,6 +61,12 @@ pub struct TrashResourceRow {
     pub resource_created_at: DateTime<Utc>,
     pub modified_at: DateTime<Utc>,
     pub owner_id: Uuid,
+    /// Raw BLAKE3 content hash. `Some(_)` for file rows, `None` for
+    /// folder rows. Feeds `File::compute_etag` so the trash listing's
+    /// `etag` matches what GET/HEAD/PROPFIND would return for the
+    /// same file (restorable trash items are conditional-request
+    /// targets too).
+    pub blob_hash: Option<String>,
     pub trashed_at: DateTime<Utc>,
     pub deletion_date: DateTime<Utc>,
     /// Original location path (for folders: `path`; for files: `parent.path || '/' || name`).