feat(appendix): 添加多个交互式演示组件，完善 AI/Infra 等章节内容

- 新增 Vibe Coding 全栈相关演示组件 (DeveloperSkillShift, FrontendTriad, BackendCore 等)
- 新增 RAG 相关组件 (RAGPipeline, ChunkingStrategy, Retrieval 等)
- 新增 Embedding & Vector 相关组件 (EmbeddingConcept, VectorSimilarity 等)
- 新增 AI Native App 设计组件 (AINativeArch, PromptDesign 等)
- 新增 Infrastructure as Code 组件 (IaCConcept, TerraformWorkflow 等)
- 新增 DNS & HTTPS 演示组件 (DnsResolution, HttpsHandshake 等)
- 新增 Model Finetuning 组件 (FinetuningPipeline 等)
- 更新多个章节的 markdown 内容，集成交互式演示

docs/.vitepress/theme/components/appendix/computer-fundamentals/PowerOnDemo.vue

@@ -0,0 +1,115 @@
+<template>
+  <div class="power-on-demo">
+    <div class="demo-label">电脑启动第一步 ── 点击通电</div>
+
+    <div class="sequence" @click="powerOn = !powerOn">
+      <div class="step" :class="{ active: powerOn }">
+        <div class="step-icon">🔌</div>
+        <div class="step-name">电源</div>
+        <div class="step-status">{{ powerOn ? '✅ 供电中' : '⬜ 等待' }}</div>
+      </div>
+
+      <div class="arrow">→</div>
+
+      <div class="step" :class="{ active: powerOn }">
+        <div class="step-icon">🔋</div>
+        <div class="step-name">主板</div>
+        <div class="step-status">{{ powerOn ? '✅ 唤醒' : '⬜ 等待' }}</div>
+      </div>
+
+      <div class="arrow">→</div>
+
+      <div class="step" :class="{ active: powerOn }">
+        <div class="step-icon">⚙️</div>
+        <div class="step-name">CPU</div>
+        <div class="step-status">{{ powerOn ? '✅ 复位' : '⬜ 等待' }}</div>
+      </div>
+
+      <div class="arrow">→</div>
+
+      <div class="step" :class="{ active: powerOn }">
+        <div class="step-icon">💾</div>
+        <div class="step-name">BIOS</div>
+        <div class="step-status">{{ powerOn ? '✅ 启动' : '⬜ 等待' }}</div>
+      </div>
+    </div>
+
+    <div class="tap-hint">👆 点击切换电源状态</div>
+  </div>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+const powerOn = ref(false)
+</script>
+
+<style scoped>
+.power-on-demo {
+  border: 1px solid var(--vp-c-divider);
+  border-radius: 8px;
+  background: var(--vp-c-bg-soft);
+  padding: 1rem 1.2rem;
+  margin: 1rem 0;
+  cursor: pointer;
+  user-select: none;
+}
+
+.demo-label {
+  font-size: 0.78rem;
+  font-weight: bold;
+  color: var(--vp-c-text-2);
+  margin-bottom: 0.75rem;
+  letter-spacing: 0.2px;
+}
+
+.sequence {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 0.3rem;
+}
+
+.step {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 0.6rem;
+  border-radius: 6px;
+  opacity: 0.4;
+  transition: all 0.3s;
+}
+
+.step.active {
+  opacity: 1;
+  background: var(--vp-c-bg);
+}
+
+.step-icon {
+  font-size: 1.3rem;
+  margin-bottom: 0.2rem;
+}
+
+.step-name {
+  font-size: 0.72rem;
+  font-weight: 600;
+  color: var(--vp-c-text-2);
+}
+
+.step-status {
+  font-size: 0.65rem;
+  color: var(--vp-c-text-3);
+  margin-top: 0.15rem;
+}
+
+.arrow {
+  font-size: 0.9rem;
+  color: var(--vp-c-text-3);
+}
+
+.tap-hint {
+  text-align: center;
+  font-size: 0.72rem;
+  color: var(--vp-c-text-3);
+  margin-top: 0.75rem;
+}
+</style>