fix: harden Anthropic PDF and image content handling - #1407
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Claude Code 的 Read 工具会在 tool_result 中返回图片或 PDF。LightLLM 的 Anthropic 适配层原先会丢失部分图片结构，也不能处理 PDF。
本 PR 恢复 tool_result 图片，并在显式开启 LIGHTLLM_ANTHROPIC_ENABLE_PDF_PARSING 后解析 base64 PDF：视觉模型转为 PNG 页面，文本模型使用 pdftotext；同时限制文档数、输入/输出大小、页数和处理时间，并明确拒绝 URL PDF。
验证：Anthropic 适配器测试 36/36 通过；Qwen3.5-27B 上使用 Claude Code 2.1.218 实测文本、Read 工具闭环和 PDF Read，/v1/messages 均返回 200。Black 和 git diff --check 通过。