feat(zsh-vi-man): add plugin for smart man page lookup

Adds zsh-vi-man plugin that provides smart man page lookup for zsh vi mode
and emacs mode. Press K in vi normal mode, Ctrl-X k in emacs mode, or Ctrl-K
in vi insert mode on any command or option to open its man page.

Features:
- Smart subcommand detection (git commit → man git-commit)
- Option jumping (grep -r → jumps to -r entry in man page)
- Combined options support (rm -rf → finds both -r and -f)
- Pipe support (cat file | grep -i → opens man grep)
- Multiple pager support (less, vim, nvim)

plugins/zsh-vi-man/lib/keybinding.zsh

@@ -0,0 +1,50 @@
+# lib/keybinding.zsh - Keybinding management for different shell modes
+# Supports vi normal/insert modes and emacs mode
+
+# Internal function to bind keys in all configured modes
+_zvm_man_bind_key() {
+  # Bind in vi normal mode (always enabled)
+  bindkey -M vicmd "${ZVM_MAN_KEY}" zvm-man 2>/dev/null
+
+  # Handle emacs mode binding
+  if [[ "${ZVM_MAN_ENABLE_EMACS}" == true ]]; then
+    bindkey -M emacs "${ZVM_MAN_KEY_EMACS}" zvm-man 2>/dev/null
+  else
+    # Remove existing binding if disabled
+    bindkey -M emacs -r "${ZVM_MAN_KEY_EMACS}" 2>/dev/null
+  fi
+
+  # Handle vi insert mode binding
+  if [[ "${ZVM_MAN_ENABLE_INSERT}" == true ]]; then
+    bindkey -M viins "${ZVM_MAN_KEY_INSERT}" zvm-man 2>/dev/null
+  else
+    # Remove existing binding if disabled
+    bindkey -M viins -r "${ZVM_MAN_KEY_INSERT}" 2>/dev/null
+  fi
+}
+
+# Public function for users to manually rebind if needed
+# Usage: zvm_man_rebind
+zvm_man_rebind() {
+  _zvm_man_bind_key
+}
+
+# Setup keybindings with zsh-vi-mode compatibility
+# Handles both immediate binding and lazy loading scenarios
+zvm_setup_keybindings() {
+  if (( ${+functions[zvm_after_lazy_keybindings]} )); then
+    # zsh-vi-mode is loaded with lazy keybindings, hook into it
+    if [[ -z "${ZVM_LAZY_KEYBINDINGS}" ]] || [[ "${ZVM_LAZY_KEYBINDINGS}" == true ]]; then
+      zvm_after_lazy_keybindings_commands+=(_zvm_man_bind_key)
+    else
+      _zvm_man_bind_key
+    fi
+  elif (( ${+functions[zvm_after_init]} )); then
+    # zsh-vi-mode without lazy keybindings
+    zvm_after_init_commands+=(_zvm_man_bind_key)
+  else
+    # Standalone or other vi-mode setups - bind immediately
+    _zvm_man_bind_key
+  fi
+}
+