feat: registration accepts optional content_hash from client — checksum at birth

src/api/server.rs

@@ -254,6 +254,7 @@ struct RegisterFileRequest {
     file_path: String,
     pattern: Option<String>,
     user_id: Option<i64>,
+    content_hash: Option<String>,
 }
 
 #[derive(Debug, Serialize)]
@@ -816,6 +817,7 @@ async fn register_single_file(
     state: &AppState,
     file_path: &str,
     _user_id: Option<i64>,
+    provided_hash: Option<String>,
 ) -> RegisterFileResponse {
     tracing::info!("[REGISTER] Starting registration for: {}", file_path);
 
@@ -870,8 +872,8 @@ async fn register_single_file(
         }
     };
 
-    // Step 1: Compute SHA256 of full file
-    let content_hash = sha256_file(&path).unwrap_or_default();
+    // Step 1: Compute SHA256 of full file (or use provided hash)
+    let content_hash = provided_hash.filter(|h| !h.is_empty()).unwrap_or_else(|| sha256_file(&path).unwrap_or_default());
 
     // Step 2: Hash check — same content = already registered (regardless of name)
     let videos_table = schema::table_name("videos");
@@ -1224,6 +1226,7 @@ async fn register_file(
                     &state,
                     &entry_path.to_string_lossy().to_string(),
                     req.user_id,
+                    None,
                 )
                 .await;
                 if result.success {
@@ -1260,7 +1263,7 @@ async fn register_file(
     }
 
     // 單一檔案註冊
-    let resp = register_single_file(&state, &file_path, req.user_id).await;
+    let resp = register_single_file(&state, &file_path, req.user_id, req.content_hash).await;
     return Ok(Json(resp));
 }