feat: add site-wide glossary with hover tooltips

Every abbreviation and technical term used in the site's copy (RBAC,
NAPALM, config drift, ...) now links to a new /glossary page and shows
a short definition on hover, wherever it appears in body text. Product
and vendor brand names are deliberately excluded — the glossary stays
a dictionary of vocabulary, not a company directory.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/i18n/translations.ts

@@ -12,6 +12,7 @@ const en = {
       gettingStarted: 'Getting Started',
       architecture: 'Architecture',
       nis2: 'NIS2 Compliance',
+      glossary: 'Glossary',
     },
   },
   footer: {
@@ -24,6 +25,7 @@ const en = {
     changelog: 'Changelog',
     nis2: 'NIS2',
     roadmap: 'Roadmap',
+    glossary: 'Glossary',
     mit: 'MIT License',
     privacy: 'Privacy (none collected)',
   },
@@ -295,6 +297,10 @@ const en = {
       button: 'Get started →',
     },
   },
+  glossary: {
+    heading: 'Glossary',
+    sub: 'Every abbreviation and technical term used on this site, in one place. Hover any underlined term anywhere on the site for a quick definition.',
+  },
 }
 
 type Translations = typeof en
@@ -311,6 +317,7 @@ const de: Translations = {
       gettingStarted: 'Erste Schritte',
       architecture: 'Architektur',
       nis2: 'NIS2-Compliance',
+      glossary: 'Glossar',
     },
   },
   footer: {
@@ -323,6 +330,7 @@ const de: Translations = {
     changelog: 'Changelog',
     nis2: 'NIS2',
     roadmap: 'Roadmap',
+    glossary: 'Glossar',
     mit: 'MIT-Lizenz',
     privacy: 'Datenschutz (keine Daten erhoben)',
   },
@@ -594,6 +602,10 @@ const de: Translations = {
       button: 'Loslegen →',
     },
   },
+  glossary: {
+    heading: 'Glossar',
+    sub: 'Alle Abkürzungen und Fachbegriffe dieser Website an einem Ort. Beim Hovern über einen unterstrichenen Begriff wird überall auf der Seite eine Kurzdefinition angezeigt.',
+  },
 }
 
 export const translations: Record<Lang, Translations> = { en, de }