Add support for Claude Sonnet 4.5 model

[krzemienski]

Summary

The ccflare load balancer is missing support for the newly released Claude Sonnet 4.5 model (claude-sonnet-4-5-20250929).

Current State

The following Claude 4 models are currently supported:

• Claude Opus 4 (claude-opus-4-20250514)
• Claude Opus 4.1 (claude-opus-4-1-20250805)
• Claude Sonnet 4 (claude-sonnet-4-20250514)

Requested Feature

Add full support for Claude Sonnet 4.5 including:

• Model ID definition in CLAUDE_MODEL_IDS
• Display name and short name mappings
• Addition to ALLOWED_MODELS for agent usage
• Pricing configuration
• CLI shorthand mapping (--set-model sonnet-4.5)

Implementation

This follows the same pattern as the Opus 4.1 implementation (commit 98556ae), requiring updates to:

• packages/core/src/models.ts
• packages/types/src/agent.ts
• packages/core/src/pricing.ts
• apps/tui/src/main.ts

Model Details

• Model ID: claude-sonnet-4-5-20250929
• Display Name: Claude Sonnet 4.5
• Short Name: claude-sonnet-4.5
• Pricing: Same as Sonnet 4 ($3 input, $15 output per 1M tokens)

[anonym-uz]

https://github.com/tombii/better-ccflare