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"

tests/data/test_preprocess.py

@@ -451,7 +451,7 @@ class TestPipeline:
             tokenizer_path=tokenizer_dir,
         ).run()
 
-        meta_path = os.path.join(out_dir, "__default__", "meta.json")
+        meta_path = os.path.join(out_dir, "__default__", "shard_0000", "meta.json")
         assert os.path.exists(meta_path)
         with open(meta_path, "r") as f:
             meta = json.load(f)
@@ -505,7 +505,7 @@ class TestPipeline:
             tokenizer_path=tokenizer_dir,
         ).run()
 
-        meta_path = os.path.join(out_dir, "__default__", "meta.json")
+        meta_path = os.path.join(out_dir, "__default__", "shard_0000", "meta.json")
         assert os.path.exists(meta_path)
         with open(meta_path, "r") as f:
             meta = json.load(f)
@@ -560,7 +560,7 @@ class TestPipeline:
             tokenizer_path=tokenizer_dir,
         ).run()
 
-        meta_path = os.path.join(out_dir, "__default__", "meta.json")
+        meta_path = os.path.join(out_dir, "__default__", "shard_0000", "meta.json")
         assert os.path.exists(meta_path)
         with open(meta_path, "r") as f:
             meta = json.load(f)