feat: initialize flask app skeleton

app/api/__init__.py

@@ -0,0 +1 @@
+"""API blueprints."""

app/api/health.py

@@ -0,0 +1,9 @@
+from flask import Blueprint, jsonify
+
+
+bp = Blueprint("health", __name__)
+
+
+@bp.get("/health")
+def health_check():
+    return jsonify({"ok": True})