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>

frontend/src/components/ChatWindow.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { ref, watch, nextTick } from 'vue'
 import { useChatStore } from '../stores/chat'
+import MarkdownContent from './MarkdownContent.vue'
 
 const store = useChatStore()
 const scrollEl = ref<HTMLElement | null>(null)
@@ -22,11 +23,17 @@ watch(
     <div
       v-for="(msg, i) in store.messages"
       :key="i"
-      :class="['message', msg.role, { pending: msg.pending }]"
+      :class="['message', msg.role, { error: msg.error }]"
     >
       <div class="bubble">
-        <span class="content">{{ msg.content }}</span>
-        <span v-if="msg.pending" class="cursor">▌</span>
+        <!-- ユーザーメッセージはプレーンテキスト -->
+        <template v-if="msg.role === 'user'">{{ msg.content }}</template>
+
+        <!-- アシスタントはMarkdownレンダリング -->
+        <template v-else>
+          <MarkdownContent :content="msg.content" :pending="msg.pending" />
+          <span v-if="msg.pending && !msg.content" class="cursor">▌</span>
+        </template>
       </div>
     </div>
   </div>
@@ -46,9 +53,7 @@ watch(
   color: #555;
   font-size: 14px;
 }
-.message {
-  display: flex;
-}
+.message { display: flex; }
 .message.user { justify-content: flex-end; }
 .message.assistant { justify-content: flex-start; }
 .bubble {
@@ -57,20 +62,26 @@ watch(
   border-radius: 12px;
   font-size: 14px;
   line-height: 1.6;
-  white-space: pre-wrap;
   word-break: break-word;
 }
 .user .bubble {
   background: #2563eb;
   color: #fff;
   border-bottom-right-radius: 4px;
+  white-space: pre-wrap;
 }
 .assistant .bubble {
   background: #2a2a2a;
   color: #eee;
   border-bottom-left-radius: 4px;
 }
+.message.error .bubble {
+  background: #3b1a1a;
+  color: #f87171;
+  border: 1px solid #7f1d1d;
+}
 .cursor {
+  display: inline-block;
   animation: blink 0.8s step-end infinite;
 }
 @keyframes blink { 50% { opacity: 0; } }