feat(account): add forum login and sidebar account entry

src/modules/backendApi.ts

@@ -131,8 +131,14 @@ const toSyncedAppList = (
 });
 
 export const setBackendToken = (token: string | null): void => {
-  if (token) backend.defaults.headers.common.Authorization = `Bearer ${token}`;
-  else delete backend.defaults.headers.common.Authorization;
+  const backendWithOptionalDefaults = backend as typeof backend & {
+    defaults?: { headers?: { common?: Record<string, unknown> } };
+  };
+  const commonHeaders = backendWithOptionalDefaults.defaults?.headers?.common;
+  if (!commonHeaders) return;
+
+  if (token) commonHeaders.Authorization = `Bearer ${token}`;
+  else delete commonHeaders.Authorization;
 };
 
 export const exchangeFlarumToken = async (payload: {

src/modules/flarumAuth.ts

@@ -0,0 +1,28 @@
+import axios from "axios";
+
+import { FLARUM_BASE_URL } from "@/global/storeConfig";
+import type { FlarumLoginPayload } from "@/global/typedefinition";
+
+type FlarumTokenResponse = {
+  token: string;
+  userId: string;
+};
+
+const asRecord = (value: unknown): Record<string, unknown> => {
+  if (value && typeof value === "object" && !Array.isArray(value)) {
+    return value as Record<string, unknown>;
+  }
+  return {};
+};
+
+export const requestFlarumToken = async (
+  payload: FlarumLoginPayload,
+): Promise<FlarumTokenResponse> => {
+  const response = await axios.post(`${FLARUM_BASE_URL}/api/token`, payload);
+  const data = asRecord(response.data);
+
+  return {
+    token: String(data.token || ""),
+    userId: String(data.userId || data.user_id || ""),
+  };
+};