Migrate geo backend from Django/Graphene to Express + Apollo Server + arangojs

Replace Python stack with TypeScript. All 30+ GraphQL queries preserved including
phase-based routing (Dijkstra), H3 clustering, K_SHORTEST_PATHS, and external
routing services (GraphHopper, OpenRailRouting). Single public endpoint, no auth.

package.json

@@ -0,0 +1,25 @@
+{
+  "name": "geo",
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "build": "tsc",
+    "start": "node dist/index.js",
+    "dev": "tsx --watch src/index.ts"
+  },
+  "dependencies": {
+    "@apollo/server": "^4.11.3",
+    "@sentry/node": "^9.5.0",
+    "arangojs": "^9.2.0",
+    "cors": "^2.8.5",
+    "express": "^5.0.1",
+    "h3-js": "^4.2.1"
+  },
+  "devDependencies": {
+    "@types/cors": "^2.8.17",
+    "@types/express": "^5.0.0",
+    "@types/node": "^22.13.0",
+    "tsx": "^4.19.3",
+    "typescript": "^5.7.3"
+  }
+}