security: sanitize internal infrastructure details from open source package

- Remove production_test_sequence.sh (DAW-specific production tests)
- Remove setup_env.sh (obsolete .env setup, replaced by furt.conf)
- Sanitize test scripts: replace dragons-at-work.de with example.com
- Sanitize API keys: replace dev keys with placeholder values
- Remove hardcoded DAW fallbacks from http_server.lua and smtp.lua
- Update .gitignore to exclude production-specific test files

Tests remain functional for developers with example domains.
All internal DAW infrastructure details removed from package.

Closes #101

scripts/test_smtp.sh

@@ -36,7 +36,7 @@ else
     echo "[ERROR] Validation failed"
 fi
 
-# Test 3: Invalid Email Format  
+# Test 3: Invalid Email Format
 echo ""
 echo "[3] Testing email validation..."
 email_validation_response=$(curl -s -X POST "$SERVER_URL/v1/mail/send" \
@@ -54,36 +54,36 @@ 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"
+echo "WARNING: This will send a real email to admin@example.com"
 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", 
+            "email": "test@example.com",
             "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"
-        
+        echo "Check admin@example.com 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)
@@ -126,7 +126,7 @@ echo "Performance: ${duration_ms}ms"
 echo ""
 echo "Week 2 Challenge Status:"
 echo "  SMTP Integration: COMPLETE"
-echo "  Environment Variables: CHECK .env" 
+echo "  Environment Variables: CHECK .env"
 echo "  Native Lua Implementation: DONE"
 echo "  Production Ready: READY FOR TESTING"