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.

src/index.ts

@@ -0,0 +1,33 @@
+import express from 'express'
+import cors from 'cors'
+import { ApolloServer } from '@apollo/server'
+import { expressMiddleware } from '@apollo/server/express4'
+import * as Sentry from '@sentry/node'
+import { typeDefs, resolvers } from './schema.js'
+
+const PORT = parseInt(process.env.PORT || '8000', 10)
+const SENTRY_DSN = process.env.SENTRY_DSN || ''
+
+if (SENTRY_DSN) {
+  Sentry.init({
+    dsn: SENTRY_DSN,
+    tracesSampleRate: 0.01,
+    release: process.env.RELEASE_VERSION || '1.0.0',
+    environment: process.env.ENVIRONMENT || 'production',
+  })
+}
+
+const app = express()
+app.use(cors({ origin: ['https://optovia.ru'], credentials: true }))
+
+const server = new ApolloServer({ typeDefs, resolvers, introspection: true })
+await server.start()
+
+app.use('/graphql/public', express.json(), expressMiddleware(server) as unknown as express.RequestHandler)
+
+app.get('/health', (_, res) => { res.json({ status: 'ok' }) })
+
+app.listen(PORT, '0.0.0.0', () => {
+  console.log(`Geo server ready on port ${PORT}`)
+  console.log(`  /graphql/public  - public (no auth)`)
+})