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/cleanup_debug.sh

@@ -1,61 +0,0 @@
-#!/bin/bash
-# furt-lua/scripts/cleanup_debug.sh
-# Clean up debug code and prepare for production
-
-echo "🧹 Cleaning up debug code for production..."
-
-# Remove debug config script
-if [ -f "debug_config.lua" ]; then
-    rm debug_config.lua
-    echo "✅ Removed debug_config.lua"
-fi
-
-# Check for any remaining DEBUG statements
-echo -e "\n🔍 Checking for remaining DEBUG statements:"
-debug_files=$(grep -r "DEBUG:" src/ 2>/dev/null || true)
-if [ -n "$debug_files" ]; then
-    echo "⚠️  Found DEBUG statements:"
-    echo "$debug_files"
-    echo "Please remove these manually!"
-else
-    echo "✅ No DEBUG statements found"
-fi
-
-# Check for any console.log or print statements that might be debug
-echo -e "\n🔍 Checking for debug print statements:"
-print_files=$(grep -r "print(" src/ | grep -v "-- Allow print" | grep -v "print.*error" || true)
-if [ -n "$print_files" ]; then
-    echo "⚠️  Found print statements (review if needed for production):"
-    echo "$print_files"
-else
-    echo "✅ No debug print statements found"
-fi
-
-# Check test endpoint (should be disabled in production)
-echo -e "\n🔍 Checking for test endpoints:"
-test_endpoints=$(grep -r "/test" src/ || true)
-if [ -n "$test_endpoints" ]; then
-    echo "⚠️  Found test endpoints (disable in production):"
-    echo "$test_endpoints"
-else
-    echo "✅ No test endpoints found"
-fi
-
-# Verify API keys are not hardcoded
-echo -e "\n🔍 Checking for hardcoded API keys:"
-hardcoded_keys=$(grep -r "change-me-in-production" config/ src/ || true)
-if [ -n "$hardcoded_keys" ]; then
-    echo "⚠️  Found development API keys (change for production):"
-    echo "$hardcoded_keys"
-else
-    echo "✅ No hardcoded development keys found"
-fi
-
-echo -e "\n✅ Debug cleanup complete!"
-echo "📋 Production checklist:"
-echo "  - [ ] Change API keys in .env"
-echo "  - [ ] Disable /test endpoint"
-echo "  - [ ] Set CORS_ALLOWED_ORIGINS for production"
-echo "  - [ ] Configure production SMTP settings"
-echo "  - [ ] Review log levels"
-