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/core/memory.py

@@ -36,7 +36,7 @@ async def maybe_summarize(db: DBSession, session: Session) -> None:
         {"role": "system", "content": "以下の会話を簡潔に要約してください。重要な事実・決定・文脈を保持してください。"},
         *[{"role": m.role, "content": m.content} for m in to_summarize],
     ]
-    summary_text = await llm.complete(summary_prompt)
+    summary_text = await llm.complete(summary_prompt, session_id=session.id)
 
     db.add(Memory(session_id=session.id, summary=summary_text))
     for msg in to_summarize: