refactor: clean repository structure for v0.1.0 open source release

- Remove Go artifacts (cmd/, internal/, pkg/, go.mod)
- Move furt-lua/* content to repository root
- Restructure as clean src/, config/, scripts/, tests/ layout
- Rewrite README.md as practical tool documentation
- Remove timeline references and marketing language
- Clean .gitignore from Go-era artifacts
- Update config/server.lua with example.org defaults
- Add .env.production to .gitignore for security

Repository now ready for open source distribution with minimal,
focused structure and generic configuration templates.
close issue DAW/furt#86

furt-lua/scripts/test_smtp.sh

@@ -1,132 +0,0 @@
-#!/bin/bash
-# furt-lua/scripts/test_smtp.sh
-# Test SMTP mail functionality
-
-SERVER_URL="http://127.0.0.1:8080"
-
-echo "Testing Furt SMTP Mail Functionality"
-echo "========================================"
-
-# Test 1: Server Health Check
-echo ""
-echo "[1] Testing Health Check..."
-health_response=$(curl -s "$SERVER_URL/health")
-echo "Response: $health_response"
-
-# Check if server is responding
-if echo "$health_response" | grep -q "healthy"; then
-    echo "[OK] Server is healthy"
-else
-    echo "[ERROR] Server not responding or unhealthy"
-    exit 1
-fi
-
-# Test 2: Invalid Mail Request (missing fields)
-echo ""
-echo "[2] Testing validation (missing fields)..."
-invalid_response=$(curl -s -X POST "$SERVER_URL/v1/mail/send" \
-    -H "Content-Type: application/json" \
-    -d '{"name":"Test"}')
-echo "Response: $invalid_response"
-
-# Check for validation error
-if echo "$invalid_response" | grep -q "Missing required fields"; then
-    echo "[OK] Validation working correctly"
-else
-    echo "[ERROR] Validation failed"
-fi
-
-# Test 3: Invalid Email Format  
-echo ""
-echo "[3] Testing email validation..."
-email_validation_response=$(curl -s -X POST "$SERVER_URL/v1/mail/send" \
-    -H "Content-Type: application/json" \
-    -d '{"name":"Test","email":"invalid-email","message":"Test"}')
-echo "Response: $email_validation_response"
-
-# Check for email validation error
-if echo "$email_validation_response" | grep -q "error"; then
-    echo "[OK] Email validation working"
-else
-    echo "[ERROR] Email validation failed"
-fi
-
-# Test 4: Valid Mail Request (REAL SMTP TEST)
-echo ""
-echo "[4] Testing REAL mail sending..."
-echo "WARNING: This will send a real email to michael@dragons-at-work.de"
-read -p "Continue with real mail test? (y/N): " -n 1 -r
-echo
-
-if [[ $REPLY =~ ^[Yy]$ ]]; then
-    echo "Sending real test email..."
-    
-    mail_response=$(curl -s -X POST "$SERVER_URL/v1/mail/send" \
-        -H "Content-Type: application/json" \
-        -d '{
-            "name": "Furt Test User",
-            "email": "test@dragons-at-work.de", 
-            "subject": "Furt SMTP Test - Week 2 Success!",
-            "message": "This is a test email from the Furt Lua HTTP-Server.\n\nSMTP Integration is working!\n\nTimestamp: '$(date)'\nServer: furt-lua v1.0"
-        }')
-    
-    echo "Response: $mail_response"
-    
-    # Check for success
-    if echo "$mail_response" | grep -q '"success":true'; then
-        echo "[OK] MAIL SENT SUCCESSFULLY!"
-        echo "Check michael@dragons-at-work.de inbox"
-        
-        # Extract request ID
-        request_id=$(echo "$mail_response" | grep -o '"request_id":"[^"]*"' | cut -d'"' -f4)
-        echo "Request ID: $request_id"
-    else
-        echo "[ERROR] Mail sending failed"
-        echo "Check server logs and SMTP credentials"
-        
-        # Show error details
-        if echo "$mail_response" | grep -q "error"; then
-            error_msg=$(echo "$mail_response" | grep -o '"error":"[^"]*"' | cut -d'"' -f4)
-            echo "Error: $error_msg"
-        fi
-    fi
-else
-    echo "Skipping real mail test"
-fi
-
-# Test 5: Performance Test
-echo ""
-echo "[5] Testing response time..."
-start_time=$(date +%s%N)
-perf_response=$(curl -s "$SERVER_URL/health")
-end_time=$(date +%s%N)
-
-duration_ms=$(( (end_time - start_time) / 1000000 ))
-echo "Response time: ${duration_ms}ms"
-
-if [ $duration_ms -lt 100 ]; then
-    echo "[OK] Response time excellent (< 100ms)"
-elif [ $duration_ms -lt 500 ]; then
-    echo "[OK] Response time good (< 500ms)"
-else
-    echo "[WARN] Response time slow (> 500ms)"
-fi
-
-echo ""
-echo "SMTP Test Complete!"
-echo "===================="
-echo "[OK] Health check working"
-echo "[OK] Input validation working"
-echo "[OK] Email format validation working"
-if [[ $REPLY =~ ^[Yy]$ ]]; then
-    echo "Real mail test executed"
-fi
-echo "Performance: ${duration_ms}ms"
-
-echo ""
-echo "Week 2 Challenge Status:"
-echo "  SMTP Integration: COMPLETE"
-echo "  Environment Variables: CHECK .env" 
-echo "  Native Lua Implementation: DONE"
-echo "  Production Ready: READY FOR TESTING"
-