docs(core): comprehensive development documentation and issue management system

- Complete project documentation for API gateway development
- API gateway-specific development processes and standards
- Comprehensive issue management system with script automation
- Go-specific testing guidelines for multi-service architecture

New Documentation:
- devdocs/KONZEPT.md: project philosophy, architecture, service integration patterns
- devdocs/TESTING_GUIDELINES.md: Go testing, API tests, gateway-service integration
- devdocs/development-process.md: API gateway development, multi-service coordination
- devdocs/furt-issue-management-guide.md: Furt-specific issue management workflows

Issue Management System:
- scripts/create_issue.sh: 8 preconfigured templates for API gateway development
- Furt-specific issue types: service-request, architecture, performance, security
- Script-based workflows for efficient development
- Integration with existing get_issues.sh and update_issue.sh scripts

API Gateway Development Standards:
- Service integration patterns for gateway ↔ service communication
- API-contract-first development with OpenAPI specifications
- Security-first patterns for authentication and input validation
- Multi-service testing strategies for coordinated development

This documentation enables immediate, efficient API gateway development
with clear standards, proven patterns, and automated workflows.

.gitignore

@@ -42,6 +42,8 @@ Thumbs.db
 *.tmp
 *.temp
 *.log
+.temp
+.backup
 
 # Development files
 _personal/
@@ -57,3 +59,4 @@ debug.log
 # Configuration files with secrets
 config.local.yaml
 config.production.yaml
+