Scaffold full-stack volunteer scheduling application

Go backend with domain-based packages (volunteer, schedule, timeoff,
checkin, notification), SQLite storage, JWT auth, and chi router.
React TypeScript frontend with routing, auth context, and pages for
all core features. Multi-stage Dockerfile and docker-compose included.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/db/db.go

@@ -0,0 +1,27 @@
+package db
+
+import (
+	"database/sql"
+	"fmt"
+
+	_ "modernc.org/sqlite"
+)
+
+func Open(dsn string) (*sql.DB, error) {
+	db, err := sql.Open("sqlite", dsn)
+	if err != nil {
+		return nil, fmt.Errorf("open db: %w", err)
+	}
+	if err := db.Ping(); err != nil {
+		return nil, fmt.Errorf("ping db: %w", err)
+	}
+	if _, err := db.Exec(`PRAGMA journal_mode=WAL; PRAGMA foreign_keys=ON;`); err != nil {
+		return nil, fmt.Errorf("pragma: %w", err)
+	}
+	return db, nil
+}
+
+func Migrate(db *sql.DB) error {
+	_, err := db.Exec(schema)
+	return err
+}