Add full project structure: backend, frontend, Docker, and CI workflows

- Organize backend into src/ (routes/, services/, db/) per package.json entrypoint
- Add migrations/import-mdb.js for one-time .mdb → SQLite migration
- Add public/ frontend: check ledger table, slide-in new/edit panel, PDF generation
- Add docker/Dockerfile and docker-compose.yml for self-hosted deployment
- Add .github/workflows: Docker Hub build+push on main/tags, TODO→Issues scanner
- Add GnuMICR font files (GPL-2.0) for MICR E-13B line rendering

src/db/database.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const Database = require('better-sqlite3');
+const fs = require('fs');
+const path = require('path');
+
+const DB_PATH = process.env.DB_PATH || path.join(__dirname, '../../data/ezcheck.db');
+const SCHEMA_PATH = path.join(__dirname, 'schema.sql');
+
+// Ensure data directory exists
+const dataDir = path.dirname(DB_PATH);
+if (!fs.existsSync(dataDir)) {
+  fs.mkdirSync(dataDir, { recursive: true });
+}
+
+const db = new Database(DB_PATH);
+
+// Enable WAL mode for better concurrent read performance
+db.pragma('journal_mode = WAL');
+db.pragma('foreign_keys = ON');
+
+// Initialize schema on first run
+const schema = fs.readFileSync(SCHEMA_PATH, 'utf8');
+db.exec(schema);
+
+module.exports = db;