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/db/index.js

@@ -0,0 +1,21 @@
+// Synchronous SQLite initialization. On startup ensure the data directory
+// exists, open the DB, and run schema.sql (idempotent CREATE IF NOT EXISTS).
+import Database from 'better-sqlite3'
+import { readFileSync, mkdirSync } from 'node:fs'
+import { dirname, resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const here = dirname(fileURLToPath(import.meta.url))
+const defaultPath = resolve(here, '..', 'data', 'visigine.db')
+const dbPath = process.env.DB_PATH ? resolve(process.env.DB_PATH) : defaultPath
+
+mkdirSync(dirname(dbPath), { recursive: true })
+
+export const db = new Database(dbPath)
+db.pragma('journal_mode = WAL')   // better concurrent reads
+db.pragma('foreign_keys = ON')    // enforce ON DELETE CASCADE
+
+const schema = readFileSync(new URL('./schema.sql', import.meta.url), 'utf8')
+db.exec(schema)
+
+console.log(`[db] opened ${dbPath}`)