feat: add HF real workload datasets (10k), streaming benchmark results, and BYOK budget tests

feat: platform ecosystem showcase and UI upgrade

feat: implement server-side FrugalGPT cascade router, prompt adaptation, and offline Pareto sweeps

Fix SQLite, OpenAI mock, circuit breaker fallback for pinned models, cache isolation, prefix cache answers, docs relative paths, and integration tests

feat: implement streaming request dedup, cache-affinity trie routing, speculative cascade, vegas concurrency limiter, web UI playground, and multi-tenant wallet billing

fix: resolve circuit breaker mocking and update router test assertions

feat: Kubernetes-ready multi-provider LLM gateway v0.2.0

first commit