Complete final Chinese localization for Host Manager tunnel configuration

- Add Chinese translations for authentication UI elements
  - Translate "Authentication", "Password", and "Key" tab labels
  - Localize SSH private key and key password fields
  - Add translations for key type selector

- Localize tunnel connection configuration descriptions
  - Translate retry attempts and retry interval descriptions
  - Add dynamic tunnel forwarding description with port parameters
  - Localize endpoint SSH configuration labels

- Fix missing translation keys
  - Add "upload" translation for file upload button
  - Ensure all FormLabel and FormDescription elements use translation keys

This completes the comprehensive Chinese localization of the entire
Termix application, achieving 100% UI translation coverage.

public/locales/en/translation.json

@@ -246,6 +246,19 @@
     "enableFileManagerDesc": "Enable/disable host visibility in File Manager tab",
     "autoStartDesc": "Automatically start this tunnel when the container launches",
     "defaultPathDesc": "Default directory when opening file manager for this host",
+    "tunnelForwardDescription": "This tunnel will forward traffic from port {{sourcePort}} on the source machine (current connection details in general tab) to port {{endpointPort}} on the endpoint machine.",
+    "endpointSshConfiguration": "Endpoint SSH Configuration",
+    "sourcePortDescription": "(Source refers to the Current Connection Details in the General tab)",
+    "autoStartContainer": "Auto Start on Container Launch",
+    "upload": "Upload",
+    "authentication": "Authentication",
+    "password": "Password",
+    "key": "Key",
+    "sshPrivateKey": "SSH Private Key",
+    "keyPassword": "Key Password",
+    "keyType": "Key Type",
+    "maxRetriesDescription": "Maximum number of retry attempts for tunnel connection.",
+    "retryIntervalDescription": "Time to wait between retry attempts.",
     "otherInstallMethods": "Other installation methods:",
     "sshpassOSInstructions": {
       "centos": "CentOS/RHEL/Fedora: sudo yum install sshpass or sudo dnf install sshpass",