Test: release Go-proxy RESTful contract tests verified passing in Go mode

[euvre]

Summary

Aligns Go error codes/messages with the established (Python) RESTful API contract where the Python side is the reasonable/established behavior, and releases the contract tests that now pass in Go-proxy mode (API_PROXY_SCHEME=go).

Go fixes:

• /chat/completions (non-stream): expected domain failures (missing messages, missing chat_id, unknown session/chat, unauthorized chat) now return HTTP 200 with business codes 101/102/109 via a new common.CodedError, instead of a generic HTTP 500. The non-stream response also includes audio_binary/prompt/created_at to match Python's decorate_answer shape, with metadata captured only from the final pipeline event.
• /searchbots/related_questions: a missing question is reported with the contract message instead of the Gin validator format; beta-auth failures return code 102 Authorization is not valid!, mirroring Python's login_required(auth_types=AUTH_BETA).
• PUT /datasets/{id}: dataset_id is validated as a UUID (code 101 Invalid UUID format); nonexistent datasets report lacks permission for dataset (code 102) so existence is not revealed (IDOR), matching Python.
• POST /system/tokens: accepts an empty request body (all fields optional) instead of HTTP 400.
• POST /datasets/{id}/documents/parse|stop: empty document_ids returns code 102 \document_ids` is required`.

Released from GO_ONLY_SKIPS (all verified passing against the Go server):

• test_chat_completion_validation_errors, test_chat_completion_nonstream_with_session, test_chat_completion_nonstream_with_chat_without_session, test_chat_completion_nonstream_without_chat, test_chat_completion_stream_events
• test_related_questions_contract
• test_system_tokens_auth_and_crud
• test_dataset_update_identifier_validation_contract
• test_documents_list_default_concurrent_and_filters_contract, test_documents_download_requires_auth_and_invalid_id_contract, test_documents_parse_and_stop, test_documents_stop_parse_requires_auth

Tests that still fail in Go mode (unimplemented routes, response-shape mismatches, and ingestion-pipeline parse timeouts) remain skipped.

[coderabbitai]

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📝 Walkthrough

Walkthrough

The non-stream chat completion response now includes pipeline-provided audio, prompt, and creation-time metadata, with tests covering final-event metadata and answer accumulation. Go proxy REST contract-test skip groups are updated for route support and document parsing timeout behavior.

Changes

Chat response metadata

Layer / File(s)	Summary
Non-stream response metadata and validation internal/service/chat_session.go, internal/service/chat_session_test.go	Accumulates answer data, takes audio_binary, prompt, and non-zero created_at from the final pipeline result, and tests omitted or intermediate metadata behavior.

Go proxy REST test coverage

Layer / File(s)	Summary
Go-only route skip list updates test/testcases/restful_api/conftest.py	Removes selected chat-completion, document-list, and document-download tests from skip sets while retaining other unsupported-route cases.
Document parsing timeout skip updates test/testcases/restful_api/conftest.py	Adds parse-matrix and bulk parsing contracts to the timeout skip group and removes stop-parse exemptions.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: jinhai-cn, haruko386

Poem

A rabbit twitched its whiskers bright,
Metadata hops into the light.
REST tests leap past skips anew,
While parsing guards reshuffle too.
Hop, hop—the pipeline grew!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: releasing Go-proxy REST contract tests in Go mode.
Description check	✅ Passed	The description matches the required Summary template and provides sufficient background and scope.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.65%. Comparing base (b7ddf45) to head (a0496a4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17468   +/-   ##
=======================================
  Coverage   90.65%   90.65%           
=======================================
  Files          10       10           
  Lines         717      717           
  Branches      118      118           
=======================================
  Hits          650      650           
  Misses         39       39           
  Partials       28       28           

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@internal/service/chat_session.go`:
- Around line 1695-1703: Update the metadata assignments in the non-stream
response path to run only when result.Final is true, matching the stream path’s
use of result.Final; assign AudioBinary, Prompt, and CreatedAt directly from
that final result, including empty or zero values. Add a regression test
covering conflicting intermediate and final metadata to verify only the final
event’s values are returned.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5add3f57-8114-424a-8e69-3cae04375875

📥 Commits

Reviewing files that changed from the base of the PR and between ce1f6f9 and ccc60be.

📒 Files selected for processing (2)

• internal/service/chat_session.go
• test/testcases/restful_api/conftest.py

💤 Files with no reviewable changes (1)

• test/testcases/restful_api/conftest.py