feat: full auto-install chain for all platforms

- Wire ensure_claude_code() into cmd_update() — auto npm install if missing
- uclaude_install.sh: auto-install git, python3, curl via apt/dnf/yum/brew
- uclaude_update.bat: prereq checks with winget install suggestions
- uclaude_update.ps1: auto-install via winget (git, python, node)
- install_node(): macOS support via brew, RHEL/Fedora via rpm.nodesource
- Increased npm install timeout to 300s for slow connections

claude/uclaude_install.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# UClaude — one-line installer
+# UClaude — one-line installer with full auto-install chain
 # Usage: bash <(curl -s https://git.sensey24.ru/aibot777/unlimitedcoding/raw/branch/master/claude/uclaude_install.sh)
 set -e
 
@@ -9,11 +9,59 @@ INSTALL_DIR="${UCLAUDE_DIR:-$HOME/unlimitedcoding}"
 echo "=== UClaude Installer ==="
 echo "  Install dir: $INSTALL_DIR"
 
-# Check prerequisites
-command -v git >/dev/null 2>&1 || { echo "ERROR: git not found. Install git first."; exit 1; }
-command -v python3 >/dev/null 2>&1 || { echo "ERROR: python3 not found. Install Python 3 first."; exit 1; }
-# Node.js check — will be auto-installed by updater if needed
-command -v node >/dev/null 2>&1 || echo "WARNING: node not found. Updater will attempt auto-install."
+# ---- Auto-install prerequisites ----
+
+install_pkg() {
+    # Try apt, then yum/dnf, then brew
+    if command -v apt-get >/dev/null 2>&1; then
+        apt-get update -qq && apt-get install -y -qq "$@"
+    elif command -v dnf >/dev/null 2>&1; then
+        dnf install -y -q "$@"
+    elif command -v yum >/dev/null 2>&1; then
+        yum install -y -q "$@"
+    elif command -v brew >/dev/null 2>&1; then
+        brew install "$@"
+    else
+        echo "ERROR: No package manager found. Install $* manually."
+        return 1
+    fi
+}
+
+need_sudo() {
+    if [ "$(id -u)" -ne 0 ]; then
+        echo "  Root privileges required to install packages."
+        echo "  Re-run: sudo bash <(curl -s $REPO_URL/raw/branch/master/claude/uclaude_install.sh)"
+        exit 1
+    fi
+}
+
+# Git
+if ! command -v git >/dev/null 2>&1; then
+    echo "  git not found, installing..."
+    need_sudo
+    install_pkg git
+fi
+
+# Python 3
+if ! command -v python3 >/dev/null 2>&1; then
+    echo "  python3 not found, installing..."
+    need_sudo
+    install_pkg python3
+fi
+
+# curl (needed for nodesource)
+if ! command -v curl >/dev/null 2>&1; then
+    echo "  curl not found, installing..."
+    need_sudo
+    install_pkg curl
+fi
+
+# Node.js — updater handles version check and auto-install
+if ! command -v node >/dev/null 2>&1; then
+    echo "  Node.js not found. Updater will auto-install."
+fi
+
+# ---- Clone / Update repo ----
 
 if [ -d "$INSTALL_DIR/.git" ]; then
     echo "  Already cloned, updating..."
@@ -44,7 +92,7 @@ fi
 echo ""
 echo "  Running updater..."
 
-# Run updater (needs root for cli.js replacement)
+# Run updater (needs root for cli.js replacement + node install)
 if [ "$(id -u)" -eq 0 ]; then
     python3 claude/uclaude_updater.py --force
 else