feat(app): add prerender, self-hosted fonts and privacy page

Fonts come from npm, not Google, so no third-party font requests.
Pages are prerendered at build time; browser-only code is guarded.
nginx serves per-route HTML, a real 404 and gzip.

src/assets/i18n/en.json

@@ -33,7 +33,6 @@
     "ROLE": "Senior Software Developer / Full-Stack Developer / Software Architect",
     "LOCATION": "Munich · Remote",
     "VIEW_PROJECTS": "View projects",
-    "CONTACT_ME": "Contact me",
     "SECTION": {
       "SKILLS": "Skills & Stack",
       "LANGUAGES": "Languages & Frameworks",
@@ -416,6 +415,40 @@
     "COUNTRY": "Germany",
     "CONTACT": "Contact"
   },
+  "PRIVACY": {
+    "TITLE": "Privacy policy",
+    "CONTROLLER": "Controller",
+    "SECTIONS": {
+      "HOSTING": {
+        "TITLE": "Hosting and server logs",
+        "TEXT": "This site is hosted by Hostinger [TODO: legal entity, address and log retention period to be confirmed; data processing agreement (Art. 28 GDPR) to be confirmed]. The web server writes server logs: IP address, time, requested URL and user agent. Purpose: operation and security of the site. Legal basis: Art. 6 (1) (f) GDPR. The logs are deleted after a short time [TODO: exact period]."
+      },
+      "STORAGE": {
+        "TITLE": "Local storage",
+        "TEXT": "The site stores only your language and theme (light or dark) in the local storage of your browser. There are no cookies, no tracking and no analytics tools."
+      },
+      "SERVICE_WORKER": {
+        "TITLE": "Service worker",
+        "TEXT": "A service worker keeps files of this site in the browser cache, so the site loads faster and works offline. No data is sent to third parties."
+      },
+      "FONTS": {
+        "TITLE": "Fonts",
+        "TEXT": "Fonts (Roboto, Material Icons) are loaded from this server. There is no connection to Google."
+      },
+      "EXTERNAL_LINKS": {
+        "TITLE": "External links",
+        "TEXT": "Links to Gitea, LinkedIn and Codeberg are only opened when you click them. From then on the privacy policy of the respective provider applies."
+      },
+      "RIGHTS": {
+        "TITLE": "Your rights",
+        "TEXT": "You have the right to access, rectification, erasure, restriction of processing, data portability and objection (Art. 15 to 21 GDPR). Contact: the e-mail address above."
+      },
+      "AUTHORITY": {
+        "TITLE": "Right to lodge a complaint",
+        "TEXT": "You can complain to a supervisory authority. Responsible: Bayerisches Landesamt für Datenschutzaufsicht (BayLDA), Promenade 18, 91522 Ansbach."
+      }
+    }
+  },
   "PATHFINDING": {
     "TITLE": "Pathfinding Algorithms",
     "START_NODE": "Start Node",
@@ -738,6 +771,10 @@
       "TITLE": "Imprint – Andreas Dahm",
       "DESCRIPTION": "Legal information and contact details for the Andreas Dahm Playground website."
     },
+    "PRIVACY": {
+      "TITLE": "Privacy policy – Andreas Dahm",
+      "DESCRIPTION": "Privacy policy for the Andreas Dahm Playground website."
+    },
     "STOPWATCH": {
       "TITLE": "Stopwatch – Andreas Dahm",
       "DESCRIPTION": "A simple online stopwatch with configurable interval beeps."