feat(site): port stitch design system + seed-ready content model

Ports the "Technical Editorial" design sample into real TSX wired to
Payload globals/collections. Home/About/Projects (list+detail)/Contact
pages render against Payload data. Expands schemas (Home principles,
About timeline/skills/gear, Contact channels) to cover the full design
surface. Adds seed script that populates realistic AI-drafted content
for first boot. Defers writing/resume routes per scope cut.

- Design tokens: Material-3 palette + Space Grotesk/Inter typography
  scale + dot-grid + glassmorphism utilities
- Shared layout: Nav, Footer, StatusTerminal, GridOverlay, Button,
  TechChip in src/components/site
- Schemas: expand 5 globals + 6 collections; add auto-slug hook
- Seed: scripts/seed.ts — idempotent upsert for media, categories,
  6 projects, 8 gear, 3 posts, 5 globals; generates placeholder admin
- Contact: form + /api/contact route with optional Turnstile verify
- Rename TURNSTILE_SITE_KEY -> NEXT_PUBLIC_TURNSTILE_SITE_KEY (client)
- Remove dead src/components/SiteHeader|SiteFooter|StatusTerminal

pnpm-lock.yaml

@@ -13,6 +13,9 @@ importers:
 
   .:
     dependencies:
+      '@marsidev/react-turnstile':
+        specifier: ^1.5.0
+        version: 1.5.0(react-dom@19.2.0(react@19.2.0))(react@19.2.0)
       '@payloadcms/db-postgres':
         specifier: ^3.50.0
         version: 3.82.1(payload@3.82.1(graphql@16.13.2)(typescript@5.9.3))
@@ -1046,6 +1049,12 @@ packages:
     peerDependencies:
       yjs: '>=13.5.22'
 
+  '@marsidev/react-turnstile@1.5.0':
+    resolution: {integrity: sha512-Ph6mcj8u9WBDsBO7s9jKPsyRDz1sBPBJwrk+Ngx09vFInvKsQ6U6kW5amEcGq4dHOreB6DgFrOJk7/fy318YlQ==}
+    peerDependencies:
+      react: ^17.0.2 || ^18.0.0 || ^19.0
+      react-dom: ^17.0.2 || ^18.0.0 || ^19.0
+
   '@monaco-editor/loader@1.7.0':
     resolution: {integrity: sha512-gIwR1HrJrrx+vfyOhYmCZ0/JcWqG5kbfG7+d3f/C1LXk2EvzAbHSg3MQ5lO2sMlo9izoAZ04shohfKLVT6crVA==}
 
@@ -4478,6 +4487,11 @@ snapshots:
       lexical: 0.41.0
       yjs: 13.6.30
 
+  '@marsidev/react-turnstile@1.5.0(react-dom@19.2.0(react@19.2.0))(react@19.2.0)':
+    dependencies:
+      react: 19.2.0
+      react-dom: 19.2.0(react@19.2.0)
+
   '@monaco-editor/loader@1.7.0':
     dependencies:
       state-local: 1.0.7