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/FullProcessDemo.vue

@@ -0,0 +1,120 @@
+<template>
+  <div class="full-process-demo">
+    <div class="demo-label">完整流程概览 ── 点击逐步演示</div>
+
+    <div class="process-flow">
+      <div
+        v-for="(phase, index) in phases"
+        :key="phase.name"
+        class="phase"
+        :class="{ active: currentPhase >= index }"
+        @click="currentPhase = index"
+      >
+        <div class="phase-icon">{{ phase.icon }}</div>
+        <div class="phase-name">{{ phase.name }}</div>
+        <div class="phase-steps">
+          <span v-for="step in phase.steps" :key="step" class="step-tag">{{ step }}</span>
+        </div>
+      </div>
+    </div>
+
+    <div class="tap-hint">👆 点击查看各阶段</div>
+  </div>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+const currentPhase = ref(0)
+const phases = [
+  { icon: '🔌', name: '硬件启动', steps: ['电源', '主板', 'CPU', 'BIOS'] },
+  { icon: '💻', name: '系统启动', steps: ['引导程序', '内核', '服务', '桌面'] },
+  { icon: '🌐', name: '浏览器', steps: ['双击图标', '加载程序', '显示窗口'] },
+  { icon: '📡', name: '网络请求', steps: ['URL解析', 'DNS', 'TCP', 'HTTP'] },
+  { icon: '🎨', name: '页面渲染', steps: ['HTML解析', 'CSS', '布局', '绘制'] }
+]
+</script>
+
+<style scoped>
+.full-process-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;
+}
+
+.process-flow {
+  display: flex;
+  justify-content: space-between;
+  gap: 0.5rem;
+}
+
+.phase {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 0.6rem 0.4rem;
+  background: var(--vp-c-bg);
+  border: 1px solid var(--vp-c-divider);
+  border-radius: 8px;
+  opacity: 0.4;
+  transition: all 0.3s;
+}
+
+.phase.active {
+  opacity: 1;
+  border-color: var(--vp-c-brand);
+  background: var(--vp-c-bg-soft);
+}
+
+.phase-icon {
+  font-size: 1.4rem;
+  margin-bottom: 0.3rem;
+}
+
+.phase-name {
+  font-size: 0.7rem;
+  font-weight: 600;
+  color: var(--vp-c-text-2);
+  margin-bottom: 0.4rem;
+}
+
+.phase-steps {
+  display: flex;
+  flex-direction: column;
+  gap: 0.15rem;
+  width: 100%;
+}
+
+.step-tag {
+  font-size: 0.58rem;
+  text-align: center;
+  padding: 0.15rem 0;
+  background: var(--vp-c-bg-soft);
+  border-radius: 3px;
+  color: var(--vp-c-text-3);
+}
+
+.phase.active .step-tag {
+  background: var(--vp-c-bg);
+  color: var(--vp-c-text-2);
+}
+
+.tap-hint {
+  text-align: center;
+  font-size: 0.72rem;
+  color: var(--vp-c-text-3);
+  margin-top: 0.75rem;
+}
+</style>