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/api/handlers/base/test_upstream_stream_bridge.py

@@ -0,0 +1,84 @@
+from __future__ import annotations
+
+import json
+from collections.abc import AsyncIterator
+
+import pytest
+
+from src.api.handlers.base.upstream_stream_bridge import (
+    aggregate_upstream_stream_to_internal_response,
+)
+from src.core.api_format.conversion import register_default_normalizers
+from src.core.api_format.conversion.internal import TextBlock
+
+
+async def _iter_stream_lines(lines: list[str]) -> AsyncIterator[bytes]:
+    for line in lines:
+        yield line.encode("utf-8")
+
+
+@pytest.mark.asyncio
+async def test_aggregate_claude_stream_uses_message_start_usage_when_message_delta_absent() -> None:
+    register_default_normalizers()
+
+    lines = [
+        "data: "
+        + json.dumps(
+            {
+                "type": "message_start",
+                "message": {
+                    "id": "msg_bridge_usage",
+                    "type": "message",
+                    "role": "assistant",
+                    "model": "claude-sonnet-4-5",
+                    "content": [],
+                    "usage": {
+                        "input_tokens": 120,
+                        "output_tokens": 0,
+                        "cache_read_input_tokens": 11,
+                    },
+                },
+            },
+            ensure_ascii=False,
+        )
+        + "\n",
+        "data: "
+        + json.dumps(
+            {
+                "type": "content_block_start",
+                "index": 0,
+                "content_block": {"type": "text", "text": ""},
+            },
+            ensure_ascii=False,
+        )
+        + "\n",
+        "data: "
+        + json.dumps(
+            {
+                "type": "content_block_delta",
+                "index": 0,
+                "delta": {"type": "text_delta", "text": "hello"},
+            },
+            ensure_ascii=False,
+        )
+        + "\n",
+        "data: "
+        + json.dumps({"type": "content_block_stop", "index": 0}, ensure_ascii=False)
+        + "\n",
+    ]
+
+    internal = await aggregate_upstream_stream_to_internal_response(
+        _iter_stream_lines(lines),
+        provider_api_format="claude:cli",
+        provider_name="claude_code",
+        model="claude-sonnet-4-5",
+        request_id="req_bridge_usage",
+    )
+
+    assert internal.usage is not None
+    assert internal.usage.input_tokens == 120
+    assert internal.usage.output_tokens == 0
+    assert internal.usage.cache_read_tokens == 11
+    assert len(internal.content) == 1
+    assert isinstance(internal.content[0], TextBlock)
+    assert internal.content[0].text == "hello"