feat: comprehensive documentation and demo updates

- Update READMEs and docs across multiple languages
- Enhance interactive demos for Agent, LLM, VLM, Audio, Image Gen, Terminal, and Web Basics
- Add new appendix sections for Database and IDE intros
- Update VitePress config, theme, and utility scripts
- Clean up unused assets and components

docs/.vitepress/theme/components/appendix/context-engineering/SlidingWindowDemo.vue

@@ -0,0 +1,237 @@
+<template>
+  <div class="sliding-window-demo">
+    <div class="viz-container">
+      <!-- Hidden Messages (History) -->
+      <div class="message-zone history">
+        <div class="zone-label">History (Forgotten)</div>
+        <transition-group name="list">
+          <div
+            v-for="msg in historyMessages"
+            :key="msg.id"
+            class="message-bubble faded"
+          >
+            <span class="role">{{ msg.role }}:</span> {{ msg.content }}
+          </div>
+        </transition-group>
+      </div>
+
+      <!-- Active Window -->
+      <div class="window-frame">
+        <div class="window-header">
+          <span>Active Context Window</span>
+          <span class="capacity">Capacity: {{ windowSize }} msgs</span>
+        </div>
+        <div class="message-zone active">
+          <transition-group name="list">
+            <div
+              v-for="msg in activeMessages"
+              :key="msg.id"
+              class="message-bubble"
+              :class="msg.role"
+            >
+              <span class="role">{{ msg.role }}:</span> {{ msg.content }}
+            </div>
+          </transition-group>
+          <div v-if="activeMessages.length === 0" class="empty-state">
+            Start chatting to fill the window...
+          </div>
+        </div>
+      </div>
+    </div>
+
+    <div class="controls">
+      <div class="input-group">
+        <input
+          v-model="newMessage"
+          @keyup.enter="sendMessage"
+          placeholder="Type a message..."
+        />
+        <button @click="sendMessage">Send</button>
+      </div>
+      <div class="actions">
+        <button class="secondary" @click="reset">Reset</button>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { ref, computed } from 'vue'
+
+const windowSize = 4
+const messages = ref([])
+const newMessage = ref('')
+let msgId = 0
+
+const activeMessages = computed(() => {
+  return messages.value.slice(-windowSize)
+})
+
+const historyMessages = computed(() => {
+  return messages.value.slice(
+    0,
+    Math.max(0, messages.value.length - windowSize)
+  )
+})
+
+const sendMessage = () => {
+  if (!newMessage.value.trim()) return
+
+  messages.value.push({
+    id: msgId++,
+    role: 'User',
+    content: newMessage.value
+  })
+
+  // Simulate AI response
+  setTimeout(() => {
+    messages.value.push({
+      id: msgId++,
+      role: 'AI',
+      content: `Response to "${newMessage.value}"`
+    })
+  }, 500)
+
+  newMessage.value = ''
+}
+
+const reset = () => {
+  messages.value = []
+  msgId = 0
+}
+</script>
+
+<style scoped>
+.sliding-window-demo {
+  border: 1px solid var(--vp-c-divider);
+  border-radius: 8px;
+  background-color: var(--vp-c-bg-soft);
+  padding: 1.5rem;
+  margin: 1rem 0;
+  font-family: var(--vp-font-family-mono);
+}
+
+.viz-container {
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+  margin-bottom: 1.5rem;
+  min-height: 300px;
+}
+
+.message-zone {
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+}
+
+.message-zone.history {
+  opacity: 0.5;
+  border-bottom: 2px dashed var(--vp-c-divider);
+  padding-bottom: 1rem;
+}
+
+.window-frame {
+  border: 2px solid var(--vp-c-brand);
+  border-radius: 8px;
+  padding: 1rem;
+  background: var(--vp-c-bg);
+  position: relative;
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+}
+
+.window-header {
+  display: flex;
+  justify-content: space-between;
+  margin-bottom: 1rem;
+  font-size: 0.8rem;
+  font-weight: bold;
+  color: var(--vp-c-brand);
+  border-bottom: 1px solid var(--vp-c-divider);
+  padding-bottom: 0.5rem;
+}
+
+.message-bubble {
+  padding: 0.5rem 0.8rem;
+  border-radius: 6px;
+  background: var(--vp-c-bg-alt);
+  font-size: 0.9rem;
+  border: 1px solid var(--vp-c-divider);
+}
+
+.message-bubble.User {
+  align-self: flex-end;
+  background: #eff6ff;
+  border-color: #bfdbfe;
+  color: #1e3a8a;
+}
+
+.message-bubble.AI {
+  align-self: flex-start;
+  background: #f0fdf4;
+  border-color: #bbf7d0;
+  color: #14532d;
+}
+
+.message-bubble.faded {
+  background: var(--vp-c-bg-soft);
+  color: var(--vp-c-text-3);
+  border-color: transparent;
+}
+
+.empty-state {
+  text-align: center;
+  color: var(--vp-c-text-3);
+  margin-top: 2rem;
+}
+
+.controls {
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+}
+
+.input-group {
+  display: flex;
+  gap: 0.5rem;
+}
+
+input {
+  flex: 1;
+  padding: 0.6rem;
+  border: 1px solid var(--vp-c-divider);
+  border-radius: 4px;
+  background: var(--vp-c-bg);
+}
+
+button {
+  padding: 0.5rem 1rem;
+  background: var(--vp-c-brand);
+  color: white;
+  border: none;
+  border-radius: 4px;
+  cursor: pointer;
+}
+
+button.secondary {
+  background: var(--vp-c-bg-alt);
+  color: var(--vp-c-text-1);
+  border: 1px solid var(--vp-c-divider);
+}
+
+/* Transitions */
+.list-enter-active,
+.list-leave-active {
+  transition: all 0.5s ease;
+}
+.list-enter-from {
+  opacity: 0;
+  transform: translateY(20px);
+}
+.list-leave-to {
+  opacity: 0;
+  transform: translateY(-20px);
+}
+</style>