feat: introduce backend url environment variable

ref: N25B-352

src/components/Logging/useLogs.ts

@@ -5,6 +5,7 @@ import {useCallback, useEffect, useRef, useState} from "react";
 
 import {applyPriorityPredicates, type PriorityFilterPredicate} from "../../utils/priorityFiltering.ts";
 import {cell, type Cell} from "../../utils/cellStore.ts";
+import { API_BASE_URL } from "../../config/api.ts";
 
 type ExtraLevelName = 'LLM' | 'OBSERVATION' | 'ACTION' | 'CHAT';
 
@@ -210,7 +211,7 @@ export function useLogs(filterPredicates: Map<string, LogFilterPredicate>) {
     // Only create one SSE connection for the lifetime of the hook.
     if (sseRef.current) return;
 
-    const es = new EventSource("http://localhost:8000/logs/stream");
+    const es = new EventSource(`${API_BASE_URL}/logs/stream`);
     sseRef.current = es;
 
     es.onmessage = (event) => {