update

app/routes/__init__.py

@@ -0,0 +1 @@
+"""Route blueprints for the KSP application."""

app/routes/api.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+from flask import Blueprint, jsonify, request
+
+from app.services.fuel_conversion import convert_value, list_fuel_factors
+
+
+api_bp = Blueprint("api", __name__, url_prefix="/api/v1")
+
+
+@api_bp.get("/health")
+def health() -> tuple[str, int] | tuple[dict[str, str], int] | object:
+    return jsonify({"status": "ok", "service": "ksp-data-hangar"})
+
+
+@api_bp.get("/fuel-converter/fuels")
+def fuel_factors() -> object:
+    return jsonify({"fuels": list_fuel_factors()})
+
+
+@api_bp.route("/fuel-converter/convert", methods=["GET", "POST"])
+def convert_fuel() -> object:
+    payload = request.get_json(silent=True) or request.args
+    mode = payload.get("mode", "")
+    value = payload.get("value")
+
+    try:
+        result = convert_value(mode=mode, raw_value=value)
+    except ValueError as exc:
+        return jsonify({"error": str(exc)}), 400
+
+    return jsonify(result)