feat: add Wave 3 homepage sections (11 Vue components) [3/3] (#10142)

## Summary
Adds all 11 homepage section components for the comfy.org marketing
site.

## Changes (incremental from #10141)
- HeroSection.vue: C monogram left, headline right, CTAs
- SocialProofBar.vue: 12 enterprise logos + metrics
- ProductShowcase.vue: PLACEHOLDER workflow demo
- ValuePillars.vue: Build/Customize/Refine/Automate/Run
- UseCaseSection.vue: PLACEHOLDER industries
- CaseStudySpotlight.vue: PLACEHOLDER bento grid
- TestimonialsSection.vue: Filterable by industry
- GetStartedSection.vue: 3-step flow
- CTASection.vue: Desktop/Cloud/API cards
- ManifestoSection.vue: Method Not Magic
- AcademySection.vue: Learning paths CTA
- Updated index.astro + zh-CN/index.astro

## Stack (via Graphite)
- #10140 [1/3] Scaffold
- #10141 [2/3] Layout Shell
- **[3/3] Homepage Sections** ← this PR (top of stack)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-10142-feat-add-Wave-3-homepage-sections-11-Vue-components-3-3-3266d73d36508194aa8ee9385733ddb9)
by [Unito](https://www.unito.io)

apps/website/src/components/ManifestoSection.vue

@@ -0,0 +1,26 @@
+<template>
+  <section class="bg-black py-24">
+    <div class="mx-auto max-w-4xl px-6 text-center">
+      <!-- Decorative quote mark -->
+      <span class="text-6xl text-brand-yellow opacity-30" aria-hidden="true">
+        &laquo;
+      </span>
+
+      <h2 class="text-4xl font-bold text-white md:text-5xl">
+        Method, Not Magic
+      </h2>
+
+      <p class="mx-auto mt-6 max-w-2xl text-lg leading-relaxed text-smoke-700">
+        We believe in giving creators real control over AI. Not black boxes. Not
+        magic buttons. But transparent, reproducible, node-by-node control over
+        every step of the creative process.
+      </p>
+
+      <!-- Separator line -->
+      <div
+        class="mx-auto mt-8 h-0.5 w-24 bg-brand-yellow opacity-30"
+        aria-hidden="true"
+      />
+    </div>
+  </section>
+</template>