refactor(monitoring): N2 - tach monitoring_tab.py, CanonicalAuditLogger, MonitoringQueryService, go circular import, sandbox matrix

- ui/monitoring_tab.py (1546 dong) tach thanh presentation/monitoring/**
  (container + 7 tab/card + shared helper), ui/monitoring_tab.py con lai
  re-export shim de app.py khong doi.
- infrastructure/telemetry/audit_logger.py: CanonicalAuditLogger, core/audit_log.py
  thanh wrapper mong, tuong thich nguoc 100% voi schema .jsonl cu.
- application/monitoring/monitoring_query_service.py: MonitoringQueryService
  read-only, filter/sort/pagination, khong import PySide6.
- Go circular import model_pricing<->usage_tracker va agent_security<->
  agent_security_alert (core/agent_security_types.py moi).
- infrastructure/sandbox/sandbox_capabilities.py: SandboxCapabilityMatrix
  theo OS (Windows/Linux/macOS), chua dau noi vao core/sandbox_manager.py.
- conftest.py: sua loi checkout khong ten cowork_local khien pytest import
  nham thu muc khac.
- 77 test moi, 167/167 pass. QA da xac nhan UI/business logic khong doi
  (xem evidence/report/unified_report.html).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

application/monitoring/repository/audit_event_repository.py

@@ -0,0 +1,41 @@
+"""Audit-event repository — the boundary between ``MonitoringQueryService``
+and where events actually live. ``CanonicalAuditEventRepository`` is the real
+adapter (wraps an injected ``CanonicalAuditLogger``); ``InMemoryAuditEventRepository``
+is a constructor-injected test double, following this repo's existing
+``Fake*``/``Recording*`` convention (see ``tests/routing/*``,
+``tests/test_project_context_mcp_template.py``) rather than ``unittest.mock``.
+"""
+from __future__ import annotations
+
+from typing import List, Optional, Protocol
+
+from ..dto.audit_event_dto import AuditEventDTO
+
+
+class AuditEventRepository(Protocol):
+    def load(self, kind: Optional[str] = None) -> List[AuditEventDTO]:
+        ...
+
+
+class CanonicalAuditEventRepository:
+    """Adapter over ``infrastructure.telemetry.audit_logger.CanonicalAuditLogger``
+    — the only place this application service reaches into infrastructure."""
+
+    def __init__(self, audit_logger) -> None:
+        self._audit_logger = audit_logger
+
+    def load(self, kind: Optional[str] = None) -> List[AuditEventDTO]:
+        events = self._audit_logger.load_events(kind=kind)
+        return [AuditEventDTO.from_raw(e.to_dict()) for e in events]
+
+
+class InMemoryAuditEventRepository:
+    """Test double — holds a fixed list of events, no file I/O."""
+
+    def __init__(self, events: List[AuditEventDTO]) -> None:
+        self._events = list(events)
+
+    def load(self, kind: Optional[str] = None) -> List[AuditEventDTO]:
+        if kind is None:
+            return list(self._events)
+        return [e for e in self._events if e.kind == kind]