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>

bedrock_test.ps1

@@ -0,0 +1,5 @@
+curl.exe --ssl-no-revoke -X POST `
+  -H "Authorization: Bearer $env:AWS_BEARER_TOKEN_BEDROCK" `
+  -H "Content-Type: application/json" `
+  "https://bedrock-runtime.ap-northeast-1.amazonaws.com/model/jp.anthropic.claude-sonnet-4-6/converse" `
+  -d '{\"messages\":[{\"role\":\"user\",\"content\":[{\"text\":\"hi\"}]}]}'