add openai integration + sqlite3 local db

[amruth-sn]

Summary by cubic

Adds OpenAI provider support and a local SQLite-backed config store, plus a first-run setup wizard and provider-aware cost tracking. Updates the README with multi-provider usage, new env vars, and CLI flags.

• New Features

  • Multi-provider LLM support: Anthropic (Claude) and OpenAI (GPT-4o), with smart routing.
  • kong setup wizard to configure providers and default models.
  • SQLite config store under ~/.config/kong (override with KONG_CONFIG_DIR).
  • Provider-aware token and cost tracking, pricing registry, and model limits/rate limiter.
  • CLI: --provider and --model flags; examples updated.
  • Docs list anthropic and openai SDKs.

• Migration

  • Set at least one API key: ANTHROPIC_API_KEY or OPENAI_API_KEY.
  • Run kong setup once to choose a default provider/model.
  • Use --provider openai and optional --model to override per run.

^{Written for commit b9db0c5. Summary will update on new commits.}

[cubic-dev-ai]

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