fix(core): add "thinking" to Part.type Literal to match Go API schema (#402)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: GenerQAQ

src/server/core/acontext_core/schema/orm/message.py

@@ -37,8 +37,8 @@ class Part(BaseModel):
     """Message part model matching the GORM Part struct"""
 
     type: Literal[
-        "text", "image", "audio", "video", "file", "tool-call", "tool-result", "data"
-    ]  # "text" | "image" | "audio" | "video" | "file" | "tool-call" | "tool-result" | "data"
+        "text", "image", "audio", "video", "file", "tool-call", "tool-result", "data", "thinking"
+    ]  # "text" | "image" | "audio" | "video" | "file" | "tool-call" | "tool-result" | "data" | "thinking"
 
     # text part
     text: Optional[str] = None

src/server/core/tests/schema/test_part.py

@@ -0,0 +1,44 @@
+import pytest
+from pydantic import ValidationError
+from acontext_core.schema.orm.message import Part
+
+
+VALID_PART_TYPES = [
+    "text",
+    "image",
+    "audio",
+    "video",
+    "file",
+    "tool-call",
+    "tool-result",
+    "data",
+    "thinking",
+]
+
+
+@pytest.mark.parametrize("part_type", VALID_PART_TYPES)
+def test_part_accepts_valid_types(part_type):
+    part = Part(type=part_type)
+    assert part.type == part_type
+
+
+def test_part_rejects_invalid_type():
+    with pytest.raises(ValidationError):
+        Part(type="unknown")
+
+
+def test_thinking_part_with_signature():
+    part = Part(
+        type="thinking",
+        text="Let me think about this.",
+        meta={"signature": "abc123"},
+    )
+    assert part.type == "thinking"
+    assert part.text == "Let me think about this."
+    assert part.meta["signature"] == "abc123"
+
+
+def test_thinking_part_minimal():
+    part = Part(type="thinking", text="thinking text")
+    assert part.type == "thinking"
+    assert part.meta is None