Initial commit: Visigine (Vite client + Express/SQLite backend)

Container-ready via docker/ compose (frontend nginx + backend Node). Compose adjusted for Coolify on the prod server: frontend uses expose:80 (no host binding — host 8080 is taken by the Coolify proxy; Traefik routes visigine.de), backend ALLOWED_ORIGINS=https://visigine.de. Secrets stay in server/.env (git-ignored); see server/.env.example.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/lib/cache.js

@@ -0,0 +1,26 @@
+// Simple in-memory LRU with TTL.
+// Map preserves insertion order — evict oldest on overflow; refresh on read.
+const TTL_MS = 60 * 60 * 1000
+const MAX_ENTRIES = 1000
+
+const store = new Map()
+
+export function cacheGet(key) {
+  const entry = store.get(key)
+  if (!entry) return null
+  if (Date.now() > entry.expiresAt) {
+    store.delete(key)
+    return null
+  }
+  store.delete(key)
+  store.set(key, entry)
+  return entry.value
+}
+
+export function cacheSet(key, value) {
+  if (store.size >= MAX_ENTRIES) {
+    const oldest = store.keys().next().value
+    store.delete(oldest)
+  }
+  store.set(key, { value, expiresAt: Date.now() + TTL_MS })
+}