feat: add MiniMax as LLM provider with model registry and cost tracking

[octo-patch]

Summary

• Add MiniMax as a first-class LLM provider in Helicone's model registry
• Register 4 models: MiniMax-M2.7, M2.7-highspeed, M2.5, M2.5-highspeed with accurate pricing
• Integrate with gateway routing (URL pattern matching, provider name mapping, usage processing)
• Full test coverage: 24 unit tests + 8 integration tests (all passing)

Changes

Provider (packages/cost/models/providers/)

• minimax.ts — MiniMaxProvider extending BaseProvider, OpenAI-compatible (api.minimax.io/v1/chat/completions)
• index.ts — Register singleton, add to ResponsesAPIEnabledProviders
• priorities.ts — Priority 4 (standard third-party)

Model Registry (packages/cost/models/authors/minimax/)

• minimax-m2.7/ — M2.7 ($0.20/$1.10 per 1M, 1M ctx) + M2.7-highspeed ($0.10/$0.55 per 1M)
• minimax-m2.5/ — M2.5 ($0.20/$1.10 per 1M, 204K ctx) + M2.5-highspeed ($0.10/$0.55 per 1M)
• index.ts / metadata.ts — Aggregation and author metadata

Integration

• registry.ts / registry-types.ts — Add MiniMax models and endpoints to combined registry
• provider-helpers.ts — heliconeProviderToModelProviderName("MINIMAX") + dbProviderToProvider
• mappings.ts — URL pattern api.minimax.io → MINIMAX provider name
• types.ts — Add "minimax" to AUTHORS, "MiniMax" to Tokenizer
• getUsageProcessor.ts — Route to OpenAIUsageProcessor (OpenAI-compatible format)

Tests (packages/__tests__/cost/providers/)

• minimax.test.ts — 24 unit tests (provider class, registry, name mapping, endpoints, pricing, parameters)
• minimax-integration.test.ts — 8 integration tests (model parsing, URL building, usage processing, PTB endpoints, full request flow)

Test plan

• All 222 existing + new tests pass (npx jest __tests__/cost/ --no-coverage)
• Registry snapshots updated
• No breaking changes to existing providers

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