fix: correct DockerfileUbuntu package list, add rustup install, and fix terminal init sequence

- Fix typo in DockerfileDrive COPY command (COpy -> COPY)
- Add xterm, valgrind, ack, irssi, lynx packages to DockerfileUbuntu
- Add rustup installation with nightly toolchain in DockerfileUbuntu
- Fix r binary move path in DockerfileUbuntu (add trailing /r)
- Remove CMD ["r"] from DockerfileUbuntu
- Replace terminal.html onopen handler: call fitAddon.fit() and send form feed instead of hardcoded green text
- Add $HOME/bin to PATH in .bashrc
- Add resize command to .bashrc for terminal geometry sync
- Delete terminal/.rcontext.txt file entirely

DockerfileDrive

@@ -6,7 +6,7 @@ RUN apk add --no-cache gcc musl-dev linux-headers git openssh
 
 COPY pyproject.toml pyproject.toml 
 COPY src src
-COpy ssh_host_key ssh_host_key
+COPY ssh_host_key ssh_host_key
 RUN pip install --upgrade pip
 RUN pip install -e .
 EXPOSE 2225