Add system memory monitoring, Bedrock support, and Discord integrations

- Add CPU/GPU memory monitoring endpoint and frontend widget
- Add Amazon Bedrock model support (API key / inference profiles) plus model selector entries
- Add Discord weather/laundry notification job (JMA forecast + LLM-generated message)
- Add Discord bot that replies to mentions via the configured LLM, with weather-aware context
- Add scheduled "useless tips" job with separate webhook and quiet-hours skip
- Switch FastAPI startup to lifespan handler, log viewer, markdown rendering, and toast UI additions

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/main.py

@@ -1,11 +1,25 @@
+import asyncio
+from contextlib import asynccontextmanager
+
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
 from app.core.config import CORS_ORIGINS
+from app.core.discord_bot import start_discord_bot
+from app.core.scheduler import start_scheduler
 from app.db.database import init_db
-from app.api import chat, memory
+from app.api import chat, memory, logs, system
 
-app = FastAPI(title="PlayChat API", version="0.1.0")
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    init_db()
+    start_scheduler()
+    asyncio.create_task(start_discord_bot())
+    yield
+
+
+app = FastAPI(title="PlayChat API", version="0.1.0", lifespan=lifespan)
 
 app.add_middleware(
     CORSMiddleware,
@@ -16,13 +30,10 @@ app.add_middleware(
 )
 
 
-@app.on_event("startup")
-def on_startup():
-    init_db()
-
-
 app.include_router(chat.router)
 app.include_router(memory.router)
+app.include_router(logs.router)
+app.include_router(system.router)
 
 
 @app.get("/health")