feat: implement authentication flow with login, registration, and OAuth support

src/types/auth.ts

@@ -0,0 +1,49 @@
+export interface User {
+  id: number
+  email: string
+  name: string
+  picture?: string
+  role: string
+  credits: number
+  is_active: boolean
+  plan: {
+    id: number
+    name: string
+    max_credits: number
+    features: string[]
+  }
+  created_at: string
+  updated_at: string
+}
+
+export interface TokenResponse {
+  access_token: string
+  token_type: string
+  expires_in: number
+}
+
+export interface AuthResponse {
+  user: User
+  token: TokenResponse
+}
+
+export interface LoginRequest {
+  email: string
+  password: string
+}
+
+export interface RegisterRequest {
+  email: string
+  password: string
+  name: string
+}
+
+export interface AuthContextType {
+  user: User | null
+  token: string | null
+  login: (credentials: LoginRequest) => Promise<void>
+  register: (data: RegisterRequest) => Promise<void>
+  logout: () => Promise<void>
+  loading: boolean
+  setUser?: (user: User | null) => void
+}