feat(search): add missing trait methods for mock repositories

- Add search_files_paginated and count_files to MockFileRepository in share_service.rs
- Add search_files_paginated and count_files to MockFileRepository in trash_service_test.rs

These methods were added to the FileReadPort trait to support database-level
pagination for search optimization.

src/application/services/share_service.rs

@@ -483,6 +483,24 @@ mod tests {
         async fn get_blob_hash(&self, _file_id: &str) -> Result<String, DomainError> {
             Ok(String::new())
         }
+
+        async fn search_files_paginated(
+            &self,
+            _folder_id: Option<&str>,
+            _criteria: &crate::application::dtos::search_dto::SearchCriteriaDto,
+            _user_id: &str,
+        ) -> Result<(Vec<crate::domain::entities::file::File>, usize), DomainError> {
+            Ok((Vec::new(), 0))
+        }
+
+        async fn count_files(
+            &self,
+            _folder_id: Option<&str>,
+            _criteria: &crate::application::dtos::search_dto::SearchCriteriaDto,
+            _user_id: &str,
+        ) -> Result<usize, DomainError> {
+            Ok(0)
+        }
     }
 
     #[async_trait]

src/application/services/trash_service_test.rs

@@ -183,6 +183,24 @@ impl FileReadPort for MockFileRepository {
     async fn get_blob_hash(&self, _file_id: &str) -> std::result::Result<String, DomainError> {
         Ok(String::new())
     }
+
+    async fn search_files_paginated(
+        &self,
+        _folder_id: Option<&str>,
+        _criteria: &crate::application::dtos::search_dto::SearchCriteriaDto,
+        _user_id: &str,
+    ) -> std::result::Result<(Vec<File>, usize), DomainError> {
+        Ok((Vec::new(), 0))
+    }
+
+    async fn count_files(
+        &self,
+        _folder_id: Option<&str>,
+        _criteria: &crate::application::dtos::search_dto::SearchCriteriaDto,
+        _user_id: &str,
+    ) -> std::result::Result<usize, DomainError> {
+        Ok(0)
+    }
 }
 
 #[async_trait]