feat: self-serve signup Phase 2 (frontend cutover) (#162)

Co-authored-by: Michael Chihlas <michael@resolutionflow.com>
Co-committed-by: Michael Chihlas <michael@resolutionflow.com>

frontend/src/api/auth.ts

@@ -1,6 +1,13 @@
 import apiClient from './client'
 import type { Token, User, UserCreate, UserLogin, UserUpdate } from '@/types'
 
+export interface OAuthCallbackResponse {
+  access_token: string
+  refresh_token: string
+  token_type: string
+  is_new_user: boolean
+}
+
 export const authApi = {
   async register(data: UserCreate): Promise<User> {
     const response = await apiClient.post<User>('/auth/register', data)
@@ -71,6 +78,36 @@ export const authApi = {
   async verifyEmail(token: string): Promise<void> {
     await apiClient.post('/auth/email/verify', { token })
   },
+
+  async googleCallback(
+    code: string,
+    options?: { accountInviteCode?: string; invitedEmail?: string },
+  ): Promise<OAuthCallbackResponse> {
+    const response = await apiClient.post<OAuthCallbackResponse>(
+      '/auth/google/callback',
+      {
+        code,
+        account_invite_code: options?.accountInviteCode,
+        invited_email: options?.invitedEmail,
+      },
+    )
+    return response.data
+  },
+
+  async microsoftCallback(
+    code: string,
+    options?: { accountInviteCode?: string; invitedEmail?: string },
+  ): Promise<OAuthCallbackResponse> {
+    const response = await apiClient.post<OAuthCallbackResponse>(
+      '/auth/microsoft/callback',
+      {
+        code,
+        account_invite_code: options?.accountInviteCode,
+        invited_email: options?.invitedEmail,
+      },
+    )
+    return response.data
+  },
 }
 
 export default authApi