ci: split CI jobs, add clippy/test, upgrade actions

- Split single check job into frontend / rust / jdbc parallel jobs
- Add concurrency group to cancel redundant CI runs
- Add pnpm cache via setup-node
- Add cargo clippy and cargo test to CI
- Unify Node version to 22 across all workflows
- Upgrade pnpm/action-setup to v6
- Fix clippy never_loop errors (while let → if let)

crates/dbx-web/src/routes/agents.rs

@@ -139,7 +139,7 @@ pub async fn import_agents_from_zip(
     let tmp_dir = state.data_dir.join("tmp");
     std::fs::create_dir_all(&tmp_dir).map_err(|err| AppError(err.to_string()))?;
 
-    while let Some(field) = multipart.next_field().await.map_err(|err| AppError(err.to_string()))? {
+    if let Some(field) = multipart.next_field().await.map_err(|err| AppError(err.to_string()))? {
         let file_name = field.file_name().unwrap_or("offline-drivers.zip").to_string();
         if !file_name.to_ascii_lowercase().ends_with(".zip") {
             return Err(AppError("Offline driver package must be a .zip file".to_string()));

crates/dbx-web/src/routes/sql_file.rs

@@ -42,7 +42,7 @@ pub async fn preview_sql_file(
     let tmp_dir = state.data_dir.join("tmp");
     std::fs::create_dir_all(&tmp_dir).map_err(|e| AppError(e.to_string()))?;
 
-    while let Some(field) = multipart.next_field().await.map_err(|e| AppError(e.to_string()))? {
+    if let Some(field) = multipart.next_field().await.map_err(|e| AppError(e.to_string()))? {
         let file_name = field.file_name().unwrap_or("upload.sql").to_string();
         let data = field.bytes().await.map_err(|e| AppError(e.to_string()))?;
 

crates/dbx-web/src/routes/table_import.rs

@@ -30,7 +30,7 @@ pub async fn preview_import(
     let tmp_dir = state.data_dir.join("tmp");
     std::fs::create_dir_all(&tmp_dir).map_err(|e| AppError(e.to_string()))?;
 
-    while let Some(field) = multipart.next_field().await.map_err(|e| AppError(e.to_string()))? {
+    if let Some(field) = multipart.next_field().await.map_err(|e| AppError(e.to_string()))? {
         let file_name = field.file_name().unwrap_or("upload.csv").to_string();
         let data = field.bytes().await.map_err(|e| AppError(e.to_string()))?;