refactor: перенос файлов в claude/ + мульти-продуктовая структура

- Все claude-файлы перенесены в claude/ (uclaude_updater.py, скрипты, config)
- claude/README.md с инструкцией для Claude Code
- Корневой README — общий для всех продуктов (claude, codex, gemini, qwen, antigravity)
- Node.js v24.13+ автоустановка через nodesource
- Sparse checkout: клиент скачивает только latest версию cli.js

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

claude/uclaude_install.sh

@@ -0,0 +1,57 @@
+#!/bin/bash
+# UClaude — one-line installer
+# Usage: bash <(curl -s https://git.sensey24.ru/aibot777/unlimitedcoding/raw/branch/master/claude/uclaude_install.sh)
+set -e
+
+REPO_URL="https://git.sensey24.ru/aibot777/unlimitedcoding.git"
+INSTALL_DIR="${UCLAUDE_DIR:-$HOME/unlimitedcoding}"
+
+echo "=== UClaude Installer ==="
+echo "  Install dir: $INSTALL_DIR"
+
+# Check prerequisites
+command -v git >/dev/null 2>&1 || { echo "ERROR: git not found. Install git first."; exit 1; }
+command -v python3 >/dev/null 2>&1 || { echo "ERROR: python3 not found. Install Python 3 first."; exit 1; }
+# Node.js check — will be auto-installed by updater if needed
+command -v node >/dev/null 2>&1 || echo "WARNING: node not found. Updater will attempt auto-install."
+
+if [ -d "$INSTALL_DIR/.git" ]; then
+    echo "  Already cloned, updating..."
+    cd "$INSTALL_DIR"
+    git fetch --depth 1 origin master 2>/dev/null
+    git reset --hard origin/master 2>/dev/null
+else
+    echo "  Cloning (shallow, sparse — only latest version)..."
+
+    # Shallow clone without checkout
+    git clone --depth 1 --no-checkout "$REPO_URL" "$INSTALL_DIR"
+    cd "$INSTALL_DIR"
+
+    # Enable sparse checkout: root + claude core files + index.json (first pass)
+    git sparse-checkout init --no-cone
+    git sparse-checkout set '/*' 'claude/*' '!claude/releases/v*'  'claude/releases/index.json'
+    git checkout 2>/dev/null
+
+    # Read latest version from index.json and add only that release dir
+    if [ -f claude/releases/index.json ]; then
+        VER=$(python3 -c "import json; print(json.load(open('claude/releases/index.json'))['latest'])")
+        echo "  Latest version: v${VER}"
+        git sparse-checkout add "claude/releases/v${VER}"
+        git checkout 2>/dev/null
+    fi
+fi
+
+echo ""
+echo "  Running updater..."
+
+# Run updater (needs root for cli.js replacement)
+if [ "$(id -u)" -eq 0 ]; then
+    python3 claude/uclaude_updater.py --force
+else
+    echo "  Root privileges required to install cli.js."
+    sudo python3 claude/uclaude_updater.py --force
+fi
+
+echo ""
+echo "=== Installation complete ==="
+echo "  To update later: cd $INSTALL_DIR && sudo bash claude/uclaude_update.sh"