feat: partners section on the homepage (logo + URL, CMS upload)

- home.json gains a partners block (title/subtitle/items: name, url, logo),
  rendered on the homepage under the services section (next/image logos
  linking out with rel=noopener)
- CMS: partner logos uploadable from the 🎨 Logó page via POST /partner-logo
  (PNG, 1 MiB cap, filename sanitized to a slug, written to public/partners/)
- schema + types extended; guide updated

Closes MITHOME-83

proto/src/content/pages/home.json

@@ -94,6 +94,11 @@
       }
     ]
   },
+  "partners": {
+    "title": "Partnereink",
+    "subtitle": "Akikkel együtt dolgozunk",
+    "items": []
+  },
   "cta": {
     "title": "Kérjen személyre szabott ajánlatot",
     "subtitle": "Írja meg röviden, mire van szüksége; segítünk kiválasztani a vállalkozásához illő tárhely-, levelezési vagy domainmegoldást.",

proto/src/content/schema.js

@@ -22,6 +22,7 @@ const schemas = {
     hero: object({ title: string, subtitle: string, description: string, trustBullets: array(string), cta: object({ primary: ctaLink, secondary: ctaLink }) }),
     about: object({ title: string, usps: array(object({ id: string, title: string, description: string, icon: string })) }),
     services: object({ title: string, subtitle: string, items: array(object({ id: string, title: string, description: string, icon: string, features: array(string), ctaText: string })) }),
+    partners: object({ title: string, subtitle: string, items: array(object({ name: string, url: string, logo: string })) }),
     cta: object({ title: string, subtitle: string, button: string }),
     serviceFeatures: object({ title: string }),
   }),

proto/src/content/types.ts

@@ -54,6 +54,15 @@ export interface HomePageContent {
       ctaText: string
     }>
   }
+  partners: {
+    title: string
+    subtitle: string
+    items: Array<{
+      name: string
+      url: string
+      logo: string
+    }>
+  }
   cta: {
     title: string
     subtitle: string