feat(provider): 增加 Claude Code 适配器、高级配置能力与 OAuth 账号类型统一解析

- 新增 Claude Code provider adapter (context, envelope, plugin, constants)
- 扩展 provider admin 路由，支持 Claude Code 高级配置 (CRUD)
- 统一 OAuth 账号类型解析逻辑，前后端对齐
- 重构 BatchAssignModelsDialog / ModelMappingDialog，简化组件逻辑
- handler 基类增强: request_builder 支持 Claude Code 信封格式
- CLI stream/sync mixin 适配 Claude Code 流式与同步模式
- 扩展 candidate builder / failover / scheduler 对 Claude Code 的支持
- 前端增加请求时间线可视化 (HorizontalRequestTimeline)
- 补充 Claude Code envelope / runtime controls / distributed sessions 等测试

Closes #183
Closes #185

Co-Authored-By: AAEE86 <ppk0227@hotmail.com>

tests/services/test_provider_transport_claude_code.py

@@ -0,0 +1,84 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from types import SimpleNamespace
+
+import pytest
+
+from src.services.model.upstream_fetcher import UpstreamModelsFetcherRegistry
+from src.services.provider.adapters.claude_code.plugin import register_all
+from src.services.provider.transport import build_provider_url
+
+
+@dataclass
+class _DummyEndpoint:
+    base_url: str
+    api_format: str
+    custom_path: str | None = None
+    provider: object | None = None
+
+
+def test_claude_code_claude_cli_uses_messages_path() -> None:
+    endpoint = _DummyEndpoint(
+        base_url="https://api.anthropic.com",
+        api_format="claude:cli",
+        provider=SimpleNamespace(provider_type="claude_code"),
+    )
+
+    url = build_provider_url(
+        endpoint,  # type: ignore[arg-type]
+        path_params={"model": "ignored"},
+        is_stream=True,
+    )
+
+    assert url == "https://api.anthropic.com/v1/messages"
+
+
+def test_claude_code_claude_cli_does_not_duplicate_messages_suffix() -> None:
+    endpoint = _DummyEndpoint(
+        base_url="https://api.anthropic.com/v1/messages",
+        api_format="claude:cli",
+        provider=SimpleNamespace(provider_type="claude_code"),
+    )
+
+    url = build_provider_url(
+        endpoint,  # type: ignore[arg-type]
+        path_params={"model": "ignored"},
+        is_stream=False,
+    )
+
+    assert url == "https://api.anthropic.com/v1/messages"
+
+
+def test_claude_code_claude_cli_appends_query_params() -> None:
+    endpoint = _DummyEndpoint(
+        base_url="https://api.anthropic.com/v1",
+        api_format="claude:cli",
+        provider=SimpleNamespace(provider_type="claude_code"),
+    )
+
+    url = build_provider_url(
+        endpoint,  # type: ignore[arg-type]
+        query_params={"beta": "true"},
+        path_params={"model": "ignored"},
+        is_stream=False,
+    )
+
+    assert url == "https://api.anthropic.com/v1/messages?beta=true"
+
+
+@pytest.mark.asyncio
+async def test_claude_code_registers_preset_model_fetcher() -> None:
+    register_all()
+
+    fetcher = UpstreamModelsFetcherRegistry.get("claude_code")
+    assert fetcher is not None
+
+    models, errors, has_success, upstream_metadata = await fetcher(SimpleNamespace(), 1.0)
+    model_ids = {m["id"] for m in models}
+
+    assert "claude-sonnet-4-5-20250929" in model_ids
+    assert "claude-opus-4-6" in model_ids
+    assert errors == []
+    assert has_success is True
+    assert upstream_metadata is None