Test: release Go-proxy RESTful contract tests verified passing in Go mode (#17468)

### Summary

Aligns Go and Python error codes/messages so both backends honor the
same RESTful API contract, removing implementation-specific error leaks
(MySQL errors, `ValueError`, `AttributeError`, Gin validator format) in
favor of clean business error codes.

**Chat list** — invalid `orderby` now returns code 101 (was: raw Python
`AttributeError` code 100); invalid `page`/`page_size` values fall back
to defaults (was: raw `ValueError`/`ProgrammingError` code 100).

**Dataset create/update/delete** — adds UUID validation (101),
extra-field rejection (101), duplicate-id detection (101), content-type
/ JSON-syntax / object-shape checks (101), and "lacks permission" for
nonexistent datasets (IDOR). Create auto-deduplicates dataset names.
Pagerank updates tolerate a missing ES index. List response includes
`parser_config` and `pagerank`.

**Session list/update** — adds filtering, sorting, and pagination
support. Empty payloads are valid no-ops. Authorization errors map to
code 109.

**Chunk list** — doc object uses Python key names (`chunk_count`,
`dataset_id`, `chunk_method`, run text status). Add validates list
element types.

**Document update** — adds `chunk_method` alias, pydantic-style Field
error messages, metadata index auto-create with refresh, and "These
documents do not belong to dataset" messages. List validates
`metadata_condition` and reports ownership errors for unmatched name/id
filters.

**Search completion** — `kb_ids` ownership failure returns code 102
instead of 109.

Released 31 contract tests from `GO_ONLY_SKIPS` (all verified passing on
both Go and Python backends with real LLM keys).

api/apps/restful_apis/document_api.py

@@ -213,6 +213,10 @@ async def update_document(tenant_id, dataset_id, document_id):
     """
     req = await get_request_json()
 
+    # An explicit null name is a type error, not an unset field.
+    if "name" in req and req["name"] is None:
+        return get_error_data_result(message="Field: <name> - Message: <Input should be a valid string> - Value: <None>")
+
     # Verify ownership and existence of dataset and document
     if not KnowledgebaseService.query(id=dataset_id, tenant_id=tenant_id):
         return get_error_data_result(message="you don't own the dataset")
@@ -856,10 +860,25 @@ def _get_docs_with_request(req, dataset_id: str):
     """
     q = req.args
 
-    page = int(q.get("page", 1))
-    page_size = validate_rest_api_page_size(int(q.get("page_size", 30)))
+    # Invalid or negative pagination values fall back to defaults
+    # instead of leaking internal conversion/SQL errors.
+    try:
+        page = int(q.get("page", 1))
+    except (TypeError, ValueError):
+        page = 1
+    if page < 1:
+        page = 1
+    try:
+        parsed_page_size = int(q.get("page_size", 30))
+    except (TypeError, ValueError):
+        parsed_page_size = 30
+    if parsed_page_size < 0:
+        parsed_page_size = 30
+    page_size = validate_rest_api_page_size(parsed_page_size)
 
     orderby = q.get("orderby", "create_time")
+    if orderby not in ("create_time", "update_time", "name"):
+        return RetCode.ARGUMENT_ERROR, f"invalid orderby field: {orderby}", [], 0
     desc = str(q.get("desc", "true")).strip().lower() != "false"
     keywords = q.get("keywords", "")