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/api/logs.py

@@ -0,0 +1,50 @@
+from datetime import datetime
+from fastapi import APIRouter, Depends, Query
+from pydantic import BaseModel
+from sqlalchemy.orm import Session as DBSession
+from sqlalchemy import desc
+
+from app.db.database import get_db
+from app.db.models import ApiLog
+
+router = APIRouter(prefix="/logs", tags=["logs"])
+
+
+class LogResponse(BaseModel):
+    id: int
+    session_id: str | None
+    model: str
+    request_json: str
+    response_text: str | None
+    error: str | None
+    latency_ms: float | None
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+@router.get("", response_model=list[LogResponse])
+def list_logs(
+    session_id: str | None = Query(None),
+    status: str | None = Query(None, description="'ok' または 'error'"),
+    limit: int = Query(100, le=500),
+    offset: int = Query(0),
+    db: DBSession = Depends(get_db),
+):
+    q = db.query(ApiLog)
+    if session_id:
+        q = q.filter(ApiLog.session_id == session_id)
+    if status == "ok":
+        q = q.filter(ApiLog.error.is_(None))
+    elif status == "error":
+        q = q.filter(ApiLog.error.isnot(None))
+    return q.order_by(desc(ApiLog.created_at)).offset(offset).limit(limit).all()
+
+
+@router.delete("/{log_id}", status_code=204)
+def delete_log(log_id: int, db: DBSession = Depends(get_db)):
+    log = db.get(ApiLog, log_id)
+    if log:
+        db.delete(log)
+        db.commit()