Optimize zsh startup time (~10x faster)

- Add compinit caching (regenerate daily instead of every shell)
- Set skip_global_compinit to avoid double initialization
- Remove kubectl from oh-my-zsh plugins
- Add lazy-loading for kubectl completions
- Add common kubectl aliases (k, kgp, kgs, kgn, etc.)

Startup time: 1.55s → 0.15s

dot_oh-my-zsh/custom/tools/kubectl.zsh

@@ -1,6 +1,18 @@
-# Kubectl configuration
-# Auto-loaded by oh-my-zsh from $ZSH_CUSTOM/tools/
-# Note: Completions are handled by the kubectl plugin in .zshrc
+# Lazy-load kubectl completions (saves ~100ms startup time)
+if (( $+commands[kubectl] )); then
+  function kubectl() {
+    unfunction kubectl
+    source <(command kubectl completion zsh)
+    kubectl "$@"
+  }
+fi
 
-# Load golang path if exists
-[[ -f /etc/profile.d/golang_path.sh ]] && source /etc/profile.d/golang_path.sh
+# Aliases (available immediately)
+alias k='kubectl'
+alias kgp='kubectl get pods'
+alias kgs='kubectl get svc'
+alias kgn='kubectl get nodes'
+alias kga='kubectl get all'
+alias kd='kubectl describe'
+alias kl='kubectl logs'
+alias kx='kubectl exec -it'