feat: add architecture diagrams page with archify visualizations

- Create /diagrams page with interactive homelab architecture visualizations
- Add deepDive link to homelab project pointing to diagrams
- Include 4 archify diagrams:
  * Talos cluster topology (control planes, GPU worker, storage)
  * GitOps workflow (ArgoCD + Terraform)
  * LLM inference stack (vLLM, Ollama, TEI routing)
  * API request flow sequence diagram
- Support full-screen viewer and embedded grid layout
- Dark/light theme support with responsive design

tests/e2e/fixtures/test-data.ts

@@ -0,0 +1,63 @@
+/**
+ * Shared test data and constants for E2E tests
+ */
+
+export const TEST_VIEWPORTS = {
+  desktop: { width: 1920, height: 1080 },
+  tablet: { width: 768, height: 1024 },
+  mobile: { width: 375, height: 667 },
+}
+
+export const TEST_SELECTORS = {
+  // Hero section
+  heroTitle: 'h1',
+  heroSubtitle: 'text=Kubernetes',
+  exploreMoreBtn: 'button:has-text("Explore More")',
+  terminalHint: 'text=Terminal',
+
+  // Bio modal
+  bioModal: '.bg-white.dark\\:bg-gray-900.rounded-lg',
+  bioTitle: 'text=Bio',
+  bioCloseBtn: 'button:has-text("x")',
+  bioIntro: 'text=Welcome',
+
+  // Projects section
+  projectsSection: 'text=Projects',
+  projectCard: '[class*="ProjectShowcase"]',
+  projectTitle: 'text=Homelab',
+
+  // Timeline
+  timelineSection: 'text=Experience',
+
+  // Terminal
+  terminalContainer: '[class*="InteractiveTerminal"]',
+  terminalInput: 'input[placeholder*="terminal"]',
+
+  // Dark mode
+  themeToggle: 'button[aria-label*="theme"]',
+
+  // Links
+  watchVideoLink: 'text=Watch Video',
+  readArticleLink: 'text=Read Article',
+}
+
+export const TEST_TIMEOUTS = {
+  slow: 10000,
+  normal: 5000,
+  quick: 2000,
+}
+
+export const TEST_PROJECTS = [
+  'Homelab',
+  'Poimen Memory',
+  'Poimen Workflow',
+  'RBC',
+  'AWS',
+]
+
+export const TEST_BREAKPOINTS = {
+  mobile: 375,
+  tablet: 768,
+  desktop: 1280,
+  wide: 1920,
+}