feat: страница логов /ui/logs с SSE real-time потоком

- log_buffer: RingBufferHandler, кольцевой буфер 600 записей, fan-out SSE
- ui_logs: GET /ui/logs (HTML), GET /ui/logs/stream (EventSource)
- main: install_log_handler при старте, подключён router логов
- nav_rail: ссылка Логи, root_html: кнопка-ссылка Логи
- Исправлено: NaN/Inf/NUL в теле вебхука → 500 от PostgreSQL jsonb
- Тесты: test_log_buffer, test_json_sanitize; 51 passed

Made-with: Cursor

onguard24/main.py

@@ -1,3 +1,4 @@
+import asyncio
 import logging
 from contextlib import asynccontextmanager
 
@@ -5,14 +6,16 @@ from fastapi import FastAPI, Request
 from fastapi.middleware.cors import CORSMiddleware
 from starlette.responses import HTMLResponse, Response
 
+from onguard24 import __version__ as app_version
 from onguard24.config import get_settings
 from onguard24.db import create_pool
 from onguard24.domain.events import InMemoryEventBus
 from onguard24.ingress import grafana as grafana_ingress
+from onguard24.log_buffer import install_log_handler
 from onguard24.modules.registry import MODULE_MOUNTS, register_module_events
 from onguard24.root_html import render_root_page
 from onguard24.status_snapshot import build as build_status
-from onguard24 import __version__ as app_version
+from onguard24.ui_logs import router as logs_router
 
 logging.basicConfig(level=logging.INFO)
 logging.getLogger("httpx").setLevel(logging.WARNING)
@@ -31,6 +34,7 @@ def parse_addr(http_addr: str) -> tuple[str, int]:
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
+    install_log_handler(asyncio.get_event_loop())
     settings = get_settings()
     pool = await create_pool(settings)
     bus = InMemoryEventBus()
@@ -38,7 +42,7 @@ async def lifespan(app: FastAPI):
     app.state.pool = pool
     app.state.settings = settings
     app.state.event_bus = bus
-    log.info("onGuard24 started, db=%s", "ok" if pool else "disabled")
+    log.info("onGuard24 started v%s, db=%s", app_version, "ok" if pool else "disabled")
     yield
     if pool:
         await pool.close()
@@ -82,6 +86,7 @@ def create_app() -> FastAPI:
         return await build_status(request)
 
     app.include_router(grafana_ingress.router, prefix="/api/v1")
+    app.include_router(logs_router)
     for mount in MODULE_MOUNTS:
         app.include_router(mount.router, prefix=mount.url_prefix)
         if mount.ui_router is not None: