Add environment config with prod/dev API URLs

Switches Apollo client between localhost:4000 (dev) and
https://www.culpeos.com (prod) via the __DEV__ global. Also excludes
codegen.ts from the app's typecheck — it's a build-time script that
relies on Node globals not in the RN tsconfig.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dfalling

src/config/index.ts

@@ -0,0 +1,20 @@
+// Environment configuration. `__DEV__` is true in Metro/debug builds and
+// false in release builds, so dev defaults to localhost and release points
+// at production.
+
+type EnvConfig = {
+  apiUrl: string;
+  graphqlUrl: string;
+};
+
+const production: EnvConfig = {
+  apiUrl: 'https://www.culpeos.com',
+  graphqlUrl: 'https://www.culpeos.com/api/graphql',
+};
+
+const development: EnvConfig = {
+  apiUrl: 'http://localhost:4000',
+  graphqlUrl: 'http://localhost:4000/api/graphql',
+};
+
+export const config: EnvConfig = __DEV__ ? development : production;

src/graphql/client.ts

@@ -1,10 +1,7 @@
 import {ApolloClient, HttpLink, InMemoryCache} from '@apollo/client';
-
-// Phoenix GraphQL endpoint. Override at runtime once the backend is reachable;
-// kept as a constant for now so the wiring is in place.
-const GRAPHQL_URI = 'http://localhost:4000/api/graphql';
+import {config} from '../config';
 
 export const apolloClient = new ApolloClient({
-  link: new HttpLink({uri: GRAPHQL_URI}),
+  link: new HttpLink({uri: config.graphqlUrl}),
   cache: new InMemoryCache(),
 });

tsconfig.json

@@ -4,5 +4,5 @@
     "types": ["jest"]
   },
   "include": ["**/*.ts", "**/*.tsx"],
-  "exclude": ["**/node_modules", "**/Pods"]
+  "exclude": ["**/node_modules", "**/Pods", "codegen.ts"]
 }