refactor(api-server): 移除 Anthropic 预热逻辑

feat(proxy): 添加Anthropic SDK直接支持并优化Claude模型请求处理

feat(proxy): 支持长时间运行的思考请求并增加超时设置

feat(proxy): 增强请求追踪和诊断功能

feat: enhance diagnostics and logging for warmup processes

fix: remap max_tokens to max_completion_tokens for new OpenAI models

fix: AbortController + Promise.race double guarantee for warmup timeout

perf: optimize warmup & adaptive three-way racing for cold starts

feat: add logBuffer.ts

chore: update logger.ts

feat: add logs.ts

chore: update proxy.ts

chore: update app.ts

chore: update index.ts

add Anthropic keepalive warmup to reduce cold-start fallback from 55s to ~20s