feat: Upgrade to validator v2.0.0 with beta testnet real keys

Major upgrade from v1.0.0 to v2.0.0 with complete restructure:

Features:
- One-command validator setup (setup.sh)
- Automated dependency checking (Git, Rust, Node.js, build tools, Nginx)
- Shared Pezkuwi-SDK build (single build for all validators)
- Single DKSweb frontend with auto-update from GitHub
- 8 beta testnet validators (corrected from 10)
- Real validator keys from currently running beta testnet
- Helper scripts (start.sh, stop.sh, status.sh, logs.sh)
- Systemd service management
- Nginx-based frontend deployment
- Comprehensive README with usage instructions

Structure:
- validators/validator1-8/ - Individual validator configurations
- Each validator has real keys (BABE, GRANDPA, PARA, ASGN, AUDI, BEEF)
- Port allocation: RPC 9944-9951, P2P 30333-30340
- Validator 1 acts as bootnode

Breaking Changes:
- Removed docker support
- Removed old installation scripts (linux/windows)
- Removed LICENSE file
- Complete restructure of directory layout

🤖 Generated with Claude Code

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

scripts/stop.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+# Stop validator script
+# Usage: ./stop.sh [validator_number]
+
+set -e
+
+GREEN='\033[0;32m'
+RED='\033[0;31m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+if [ -z "$1" ]; then
+    echo -e "${RED}Error: Validator number required${NC}"
+    echo "Usage: $0 [validator_number]"
+    exit 1
+fi
+
+VALIDATOR_NUM=$1
+
+echo -e "${YELLOW}Stopping Validator $VALIDATOR_NUM...${NC}"
+sudo systemctl stop pezkuwi-validator-$VALIDATOR_NUM
+
+# Wait for service to stop
+sleep 2
+
+# Check status
+if sudo systemctl is-active --quiet pezkuwi-validator-$VALIDATOR_NUM; then
+    echo -e "${RED}✗ Failed to stop Validator $VALIDATOR_NUM${NC}"
+    exit 1
+else
+    echo -e "${GREEN}✓ Validator $VALIDATOR_NUM stopped successfully${NC}"
+fi