fix : 修复 created 时间戳、bin 多 shard 覆盖与文档遗漏

- openai.py/anthropic.py: created 从 0 改为 int(time.time())
- openai.py: ChatCompletionRequest 不支持参数非默认值时 warning
- pipeline.py: bin 多 shard 使用子目录避免静默覆盖
- storage.py: MmapStore/detect_format 支持多 shard 聚合加载
- architecture.md: mermaid 类图新增 Pipeline 类
- preprocessing.md: 新增多 shard 输出布局与 Python API 示例
- protocol.py: docstring "6 methods" 改为 "5 methods"

astrai/preprocessing/pipeline.py

@@ -124,7 +124,7 @@ class Pipeline:
             chunk_dir = os.path.join(self.output_dir, domain)
             fmt = self.config.output.storage_format
             if fmt == "bin":
-                save_bin(chunk_dir, tensors)
+                save_bin(os.path.join(chunk_dir, f"shard_{idx:04d}"), tensors)
             else:
                 save_h5(chunk_dir, f"data_{idx:04d}", tensors)
             shard_idx[domain] = idx + 1