Update API base URL to use REACT_APP_BACKEND_URL and include '/api' path

backend/ormconfig.json

@@ -0,0 +1,13 @@
+{
+    "type": "sqlite",
+    "database": "./src/database/database.sqlite",
+    "migrations": [
+        "./src/database/migrations/*.ts"
+    ],
+    "entities": [
+        "./src/models/*.ts"
+    ],
+    "cli": {
+        "migrationsDir": "./src/database/migrations"
+    }
+}