Simplify terminal echo: let SSH server control echo behavior

- Remove JavaScript-based echo handling and password mode detection
- Send all keystrokes directly to server without local echo manipulation
- Let SSH server handle echo control through terminal protocol
- Proper terminal behavior where server controls what gets displayed
- No more manual echo logic, respects SSH server's echo settings

templates/terminal.html

@@ -34,7 +34,6 @@ let term = null;
 let connected = false;
 let requestId = null;
 let pollInterval = null;
-let passwordMode = false;
 
 document.getElementById('connectBtn').addEventListener('click', connect);
 document.getElementById('disconnectBtn').addEventListener('click', disconnect);
@@ -130,30 +129,11 @@ function connect() {
         disconnect();
     });
 
-    // Handle input - send to server and handle local echo
+    // Handle input - send all keystrokes to server, let SSH handle echo
     term.onData(data => {
         if (!connected || !requestId) return;
 
-        // Handle special characters for local echo
-        if (data === '\r' || data === '\n') {
-            // Enter key - let server handle the command execution
-            term.write('\r\n');
-            // Exit password mode after enter
-            passwordMode = false;
-        } else if (data === '\x7f' || data === '\b') {
-            // Backspace - handle locally only if not in password mode
-            if (!passwordMode) {
-                term.write('\b \b');
-            }
-        } else if (data >= ' ' && data <= '~') {
-            // Printable characters - echo locally only if not in password mode
-            if (!passwordMode) {
-                term.write(data);
-            }
-            // Stay in password mode for printable characters
-        }
-
-        // Send data to server
+        // Send all input to server, let SSH handle echo and display
         fetch('/terminal/{{ client_id }}/data', {
             method: 'POST',
             headers: {
@@ -166,7 +146,6 @@ function connect() {
 
 function disconnect() {
     connected = false;
-    passwordMode = false; // Reset password mode
     document.getElementById('connectBtn').disabled = false;
     document.getElementById('disconnectBtn').disabled = true;
     document.getElementById('sshUsername').disabled = false;
@@ -198,20 +177,7 @@ function pollData() {
     .then(response => response.text())
     .then(data => {
         if (data) {
-            // Check for password prompts
-            if (data.toLowerCase().includes('password:') ||
-                data.toLowerCase().includes('password for') ||
-                data.toLowerCase().includes('enter passphrase')) {
-                passwordMode = true;
-            }
-
-            // Check for end of password prompt (new prompt or command output)
-            if (passwordMode && (data.includes('$ ') || data.includes('# ') ||
-                data.includes('> ') || data.includes('\n$') || data.includes('\n#'))) {
-                passwordMode = false;
-            }
-
-            // Ensure proper line ending handling
+            // Let the server handle all echo and display logic
             term.write(data.replace(/\n/g, '\r\n'));
         }
     })