Add initial Go server skeleton with HTTP handlers, middleware, job runner, and stubs

internal/infra/sqlite/db/db.go

@@ -0,0 +1,15 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+)
+
+// Open returns a connected DB instance. Caller should close.
+func Open(ctx context.Context, dsn string) (*sql.DB, error) {
+	db, err := sql.Open("sqlite", dsn)
+	if err != nil {
+		return nil, err
+	}
+	return db, nil
+}