M4b：ai_provider 删除手术①-⑥——神识全面接管模型出口

- ① 后端删除 app/ai_provider/（38 文件，含 anthropic/openai 格式、billing、audio、embedding）、services/ai_provider_admin.py、core/config/model_config.py、tests/ai_provider/（21 文件）
- ② 连带退役 application/agent/（旧 Agent 循环/steer/follow-up/确认注册表）、application/skill_executor.py、app/skills/（python skills 孤儿）、endpoints/audio.py、application/imports.py（ProviderManager 消费方）；settings 端点收敛为生成偏好
- ③ runs.py 修剪：AgentRunRegistry/steer/follow-up/confirmations 端点退役，保留 list/get/events/cancel/stream；safety 确认改为直接落库裁决（pending→approved/denied）
- ④ 前端删除：models 页、ModelGatewayView、gateway.ts、GatewayPanel（玄关）、ModelGatewayPanel/ModelStrategyForm、audio.ts/useVoiceInput、网关类型与 mock；设置页收敛为外观/语言/通知
- ⑤ 配置收敛：config/models|providers|pricing.example.yaml 归档 shenshi/config/；.env.example 删 provider keys/MODEL_ENDPOINT_POOL/MODEL_CONFIG_PATH，收敛 SHENSHI_*
- ⑥ 验收：rg 审计灵台 Provider SDK import 与 ai_provider 引用归零；后端 528 passed（2 个预存失败经 HEAD 复跑验证与本手术无关）、前端 type-check+201 passed、神识 go vet+test、BFF 4 passed

backend/tests/application/tool_runtime/test_run_scoped_view.py

@@ -1,101 +0,0 @@
-from unittest.mock import AsyncMock, MagicMock
-
-from app.application.agent.tools import to_ai_provider_tools
-from app.application.skill_executor import SkillExecutor
-from app.application.tool_runtime.view import RunScopedToolView
-from app.modules.skills.manifest import SkillManifest
-from app.modules.tool_runtime.definition import ToolResult, ToolSpec
-
-
-def _spec(name: str) -> ToolSpec:
-    return ToolSpec(
-        name=name,
-        description=f"{name} description",
-        risk_level="L1",
-        permission_policy=MagicMock(),
-        input_schema={
-            "type": "object",
-            "properties": {"value": {"type": "string"}},
-            "required": ["value"],
-        },
-    )
-
-
-async def test_aliases_are_isolated_and_execute_through_base_runtime() -> None:
-    runtime = MagicMock()
-    runtime.list_specs.return_value = [_spec("shared_tool")]
-    runtime.execute = AsyncMock(
-        return_value=ToolResult(True, 0, "ok", "", 1, False, False, "trace_1")
-    )
-    first = RunScopedToolView(runtime)
-    second = RunScopedToolView(runtime)
-
-    assert first.bind_alias("skill:甲/shared_tool", "shared_tool", description_prefix="[甲] ")
-    assert second.bind_alias("skill:乙/shared_tool", "shared_tool", description_prefix="[乙] ")
-
-    first_names = {spec.name for spec in first.list_specs()}
-    second_names = {spec.name for spec in second.list_specs()}
-    result = await first.execute(
-        "skill:甲/shared_tool",
-        {"value": "x"},
-        run_id="run_1",
-        character_id="char_1",
-    )
-
-    assert "skill:甲/shared_tool" in first_names
-    assert "skill:乙/shared_tool" not in first_names
-    assert "skill:乙/shared_tool" in second_names
-    assert "skill:甲/shared_tool" not in second_names
-    assert result.stdout == "ok"
-    runtime.execute.assert_awaited_once_with(
-        "shared_tool",
-        {"value": "x"},
-        run_id="run_1",
-        character_id="char_1",
-        trace_id=None,
-        confirmed=False,
-        context=None,
-    )
-    runtime.register.assert_not_called()
-    runtime.unregister.assert_not_called()
-
-
-def test_alias_keeps_target_input_schema() -> None:
-    runtime = MagicMock()
-    runtime.list_specs.return_value = [_spec("custom_tool")]
-    view = RunScopedToolView(runtime)
-    view.bind_alias("skill:研究/custom_tool", "custom_tool")
-
-    tools = to_ai_provider_tools(view.list_specs())
-    alias = next(tool for tool in tools if tool["function"]["name"] == "skill:研究/custom_tool")
-
-    assert alias["function"]["parameters"]["required"] == ["value"]
-
-
-async def test_skill_executor_binds_only_current_run_aliases(
-    monkeypatch,
-) -> None:
-    manifest = SkillManifest(
-        name="研究",
-        description="",
-        triggers=("研究",),
-        prompt="研究说明",
-        allowed_tools=("shared_tool", "missing"),
-        risk_level="L1",
-    )
-
-    async def load(*_args, **_kwargs):
-        return [manifest]
-
-    monkeypatch.setattr("app.application.skill_executor.load_skill_manifests", load)
-    runtime = MagicMock()
-    runtime.list_specs.return_value = [_spec("shared_tool")]
-    view = RunScopedToolView(runtime)
-    messages: list[str] = []
-
-    await SkillExecutor(view).match_and_activate("请研究", messages, run_id="run_1")
-
-    assert messages == ["【研究·能力注入】\n研究说明"]
-    assert "skill:研究/shared_tool" in view.specs_by_name()
-    assert "skill:研究/missing" not in view.specs_by_name()
-    runtime.register.assert_not_called()