feat(claude): add model alias mapping and improve key normalization

- Introduced model alias mapping for Claude configurations, enabling upstream and client-facing model name associations.
- Added `computeClaudeModelsHash` to generate a consistent hash for model aliases.
- Implemented `normalizeClaudeKey` function to standardize input API key configuration, including models.
- Enhanced executor to resolve model aliases to upstream names dynamically.
- Updated documentation and configuration examples to reflect new model alias support.

config.example.yaml

@@ -65,6 +65,9 @@ ws-auth: false
 #  - api-key: "sk-atSM..."
 #    base-url: "https://www.example.com" # use the custom claude API endpoint
 #    proxy-url: "socks5://proxy.example.com:1080" # optional: per-key proxy override
+#    models:
+#      - name: "claude-3-5-sonnet-20241022" # upstream model name
+#        alias: "claude-sonnet-latest" # client alias mapped to the upstream model
 
 # OpenAI compatibility providers
 #openai-compatibility: