feat(ssh): auto-fill ssh config parameters in auth form

Resolve SSH host parameters in auth forms and CLI connections while preserving explicit user, bookmark, and parsed alias values. Continue forwarding SSH config files for HostName and other SSH options, and document the precedence in English and Chinese.

Closes #441

src/cli/remote.rs

@@ -70,8 +70,13 @@ impl TryFrom<&Args> for RemoteArgs {
             }
 
             let remote = match addr_type {
-                AddrType::Address => Self::parse_remote_address(arg)
-                    .map(|x| Remote::Host(HostParams::new(x, password)))?,
+                AddrType::Address => Self::parse_remote_address(arg).map(|parsed| {
+                    Remote::Host(HostParams::new(
+                        parsed.file_transfer_params,
+                        parsed.port_explicit,
+                        password,
+                    ))
+                })?,
                 AddrType::Bookmark => Remote::Bookmark(BookmarkParams::new(arg, password.as_ref())),
             };
 
@@ -99,8 +104,9 @@ impl TryFrom<&Args> for RemoteArgs {
 
 impl RemoteArgs {
     /// Parse remote address
-    fn parse_remote_address(remote: &str) -> Result<FileTransferParams, String> {
-        utils::parser::parse_remote_opt(remote).map_err(|e| format!("Bad address option: {e}"))
+    fn parse_remote_address(remote: &str) -> Result<utils::parser::ParsedRemote, String> {
+        utils::parser::parse_remote_opt_with_metadata(remote)
+            .map_err(|e| format!("Bad address option: {e}"))
     }
 }
 
@@ -137,6 +143,8 @@ pub struct BookmarkParams {
 pub struct HostParams {
     /// file transfer parameters
     pub file_transfer_params: FileTransferParams,
+    /// Whether the address explicitly provided a port.
+    pub port_explicit: bool,
     /// host password specified in arguments
     pub password: Option<String>,
 }
@@ -151,9 +159,14 @@ impl BookmarkParams {
 }
 
 impl HostParams {
-    pub fn new<S: AsRef<str>>(params: FileTransferParams, password: Option<S>) -> Self {
+    pub fn new<S: AsRef<str>>(
+        params: FileTransferParams,
+        port_explicit: bool,
+        password: Option<S>,
+    ) -> Self {
         Self {
             file_transfer_params: params,
+            port_explicit,
             password: password.map(|x| x.as_ref().to_string()),
         }
     }
@@ -179,6 +192,23 @@ mod test {
         assert_eq!(remote_args.local_dir, None);
     }
 
+    #[test]
+    fn should_preserve_explicit_port_from_positional_remote() {
+        for (remote, port_explicit) in [("scp://host", false), ("scp://host:22", true)] {
+            let args = Args {
+                positional: vec![remote.to_string()],
+                ..Default::default()
+            };
+
+            let remote_args = RemoteArgs::try_from(&args).unwrap();
+            let Remote::Host(params) = remote_args.remote else {
+                panic!("expected positional remote to be a host");
+            };
+
+            assert_eq!(params.port_explicit, port_explicit, "{remote}");
+        }
+    }
+
     #[test]
     fn test_should_make_remote_args_from_args_two_remotes() {
         let args = Args {