Replace tmux with kitty

- setup.sh: install kitty instead of tmux, fix clone URL
- .bashrc: remove tmux auto-start, add kitty SSH alias
- .tmux.conf: removed
- README.md: update to kitty documentation

.bashrc

@@ -105,6 +105,7 @@ conda() {
 
 # Lazy load nvm
 load_nvm() {
+  unset -f nvm node npm
   export NVM_DIR="$HOME/.nvm"
   [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"
   [ -s "$NVM_DIR/bash_completion" ] && . "$NVM_DIR/bash_completion"
@@ -120,9 +121,14 @@ export VISUAL=vim
 
 export PATH="/usr/local/bin:$PATH"
 . "$HOME/.cargo/env"
-if command -v tmux &> /dev/null && [ -n "$PS1" ] && [[ ! "$TERM" =~ screen ]] && [[ ! "$TERM" =~ tmux ]] && [ -z "$TMUX" ]; then
-  exec tmux
+
+if [ "$TERM" = "xterm-kitty" ]; then
+  alias ssh="kitty +kitten ssh"
 fi
 
 # opencode
 export PATH=/home/james/.opencode/bin:$PATH
+export PATH="$HOME/.npm-global/bin:$PATH"
+
+# OpenClaw Completion
+source "/home/james/.openclaw/completions/openclaw.bash"