Add RoutingService that selects optimal LLM model based on task type, cost tier, capability requirements (reasoning, image, context window), and provider preference. Scoring algorithm ranks all available models. - RoutingService: route() for best match, rank() for scored list - POST /api/providers/route and /api/providers/rank endpoints - Routing types in @mosaic/types (CostTier, TaskType, RoutingCriteria) - Cost tier classification: cheap (<$1/M), standard (<$10/M), premium Closes #21 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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