Phase 1-3 of BYOK support. Introduces a 5th LLM tier 'byok' that
routes to user-provided API keys via direct browser fetches.
shared-llm additions:
- LlmTier extended with 'byok' (rank 3, between mana-server and cloud)
- ByokBackend: LlmBackend implementation that delegates key lookup
to an app-provided resolver callback, then dispatches to the right
provider adapter
- 4 provider adapters:
- OpenAI (gpt-5, gpt-4o, o1 family)
- Anthropic (Claude Opus/Sonnet/Haiku 4.6) with CORS header
- Gemini (2.5 Pro/Flash) — REST API with different message format
- Mistral — OpenAI-compatible, reuses shared openai-compat adapter
- Pricing table for 20+ models with USD per 1M tokens
- estimateCost() + formatCost() helpers
Keys stay device-local (IndexedDB in next phase). Browser-direct
fetches mean keys never touch Mana's server.
Updates two existing tier maps (memoro DetailView, SourceBadge) to
include the new tier.
Planning doc at docs/architecture/BYOK_PLAN.md.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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