refactor: clean up unused variables and empty blocks in file-manager.ts

- Remove 22 unused variables (linkCount, hostId, userId, content, escapedTempFile, index, code)
- Fix 1 empty catch block
- Simplify multiple route handlers by removing unused destructured parameters

Reduced errors from 878 to 855 (23 fixes)

src/backend/ssh/file-manager.ts

@@ -101,7 +101,9 @@ function cleanupSession(sessionId: string) {
   if (session) {
     try {
       session.client.end();
-    } catch {}
+    } catch {
+      // Ignore connection close errors
+    }
     clearTimeout(session.timeout);
     delete sshSessions[sessionId];
   }
@@ -455,7 +457,6 @@ app.get("/ssh/file_manager/ssh/listFiles", (req, res) => {
         const parts = line.split(/\s+/);
         if (parts.length >= 9) {
           const permissions = parts[0];
-          const linkCount = parts[1];
           const owner = parts[2];
           const group = parts[3];
           const size = parseInt(parts[4], 10);
@@ -694,7 +695,7 @@ app.get("/ssh/file_manager/ssh/readFile", (req, res) => {
 });
 
 app.post("/ssh/file_manager/ssh/writeFile", async (req, res) => {
-  const { sessionId, path: filePath, content, hostId, userId } = req.body;
+  const { sessionId, path: filePath, content } = req.body;
   const sshConn = sshSessions[sessionId];
 
   if (!sessionId) {
@@ -881,14 +882,7 @@ app.post("/ssh/file_manager/ssh/writeFile", async (req, res) => {
 });
 
 app.post("/ssh/file_manager/ssh/uploadFile", async (req, res) => {
-  const {
+  const { sessionId, path: filePath, content, fileName } = req.body;
-    sessionId,
-    path: filePath,
-    content,
-    fileName,
-    hostId,
-    userId,
-  } = req.body;
   const sshConn = sshSessions[sessionId];
 
   if (!sessionId) {
@@ -1022,8 +1016,6 @@ app.post("/ssh/file_manager/ssh/uploadFile", async (req, res) => {
       }
 
       if (chunks.length === 1) {
-        const tempFile = `/tmp/upload_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
-        const escapedTempFile = tempFile.replace(/'/g, "'\"'\"'");
         const escapedPath = fullPath.replace(/'/g, "'\"'\"'");
 
         const writeCommand = `echo '${chunks[0]}' | base64 -d > '${escapedPath}' && echo "SUCCESS"`;
@@ -1088,13 +1080,11 @@ app.post("/ssh/file_manager/ssh/uploadFile", async (req, res) => {
           });
         });
       } else {
-        const tempFile = `/tmp/upload_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
-        const escapedTempFile = tempFile.replace(/'/g, "'\"'\"'");
         const escapedPath = fullPath.replace(/'/g, "'\"'\"'");
 
         let writeCommand = `> '${escapedPath}'`;
 
-        chunks.forEach((chunk, index) => {
+        chunks.forEach((chunk) => {
           writeCommand += ` && echo '${chunk}' | base64 -d >> '${escapedPath}'`;
         });
 
@@ -1177,14 +1167,7 @@ app.post("/ssh/file_manager/ssh/uploadFile", async (req, res) => {
 });
 
 app.post("/ssh/file_manager/ssh/createFile", async (req, res) => {
-  const {
+  const { sessionId, path: filePath, fileName } = req.body;
-    sessionId,
-    path: filePath,
-    fileName,
-    content = "",
-    hostId,
-    userId,
-  } = req.body;
   const sshConn = sshSessions[sessionId];
 
   if (!sessionId) {
@@ -1285,7 +1268,7 @@ app.post("/ssh/file_manager/ssh/createFile", async (req, res) => {
 });
 
 app.post("/ssh/file_manager/ssh/createFolder", async (req, res) => {
-  const { sessionId, path: folderPath, folderName, hostId, userId } = req.body;
+  const { sessionId, path: folderPath, folderName } = req.body;
   const sshConn = sshSessions[sessionId];
 
   if (!sessionId) {
@@ -1386,7 +1369,7 @@ app.post("/ssh/file_manager/ssh/createFolder", async (req, res) => {
 });
 
 app.delete("/ssh/file_manager/ssh/deleteItem", async (req, res) => {
-  const { sessionId, path: itemPath, isDirectory, hostId, userId } = req.body;
+  const { sessionId, path: itemPath, isDirectory } = req.body;
   const sshConn = sshSessions[sessionId];
 
   if (!sessionId) {
@@ -1488,7 +1471,7 @@ app.delete("/ssh/file_manager/ssh/deleteItem", async (req, res) => {
 });
 
 app.put("/ssh/file_manager/ssh/renameItem", async (req, res) => {
-  const { sessionId, oldPath, newName, hostId, userId } = req.body;
+  const { sessionId, oldPath, newName } = req.body;
   const sshConn = sshSessions[sessionId];
 
   if (!sessionId) {
@@ -1596,7 +1579,7 @@ app.put("/ssh/file_manager/ssh/renameItem", async (req, res) => {
 });
 
 app.put("/ssh/file_manager/ssh/moveItem", async (req, res) => {
-  const { sessionId, oldPath, newPath, hostId, userId } = req.body;
+  const { sessionId, oldPath, newPath } = req.body;
   const sshConn = sshSessions[sessionId];
 
   if (!sessionId) {
@@ -1985,7 +1968,7 @@ app.post("/ssh/file_manager/ssh/copyItem", async (req, res) => {
 });
 
 app.post("/ssh/file_manager/ssh/executeFile", async (req, res) => {
-  const { sessionId, filePath, hostId, userId } = req.body;
+  const { sessionId, filePath } = req.body;
   const sshConn = sshSessions[sessionId];
 
   if (!sshConn || !sshConn.isConnected) {
@@ -2022,7 +2005,7 @@ app.post("/ssh/file_manager/ssh/executeFile", async (req, res) => {
       checkResult += data.toString();
     });
 
-    checkStream.on("close", (code) => {
+    checkStream.on("close", () => {
       if (!checkResult.includes("EXECUTABLE")) {
         return res.status(400).json({ error: "File is not executable" });
       }