chore(config): remove legacy debug settings and startup warnings

refactor: rename OpenAI-specific modules with _openai suffix

refactor: update kiro_gateway naming to kiro

docs: architecture for Anthropic API support (#15)

feat(tokenizer): add token counting with tiktoken for usage tracking

fix: update application version to 1.0.2

docs: update architecture documentation to match codebase

docs: update title in ARCHITECTURE.md to remove version number

docs: Add initial architecture and .gitignore