feat(frontend): Refactor to cookie-based auth and add /api/v1 prefix

frontend/src/components/auth/LoginForm.tsx

@@ -14,6 +14,7 @@ import {
 import { Input } from "@/components/ui/input"
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
 import { useState } from "react"
+import { Separator } from "@/components/ui/separator"
 
 interface LoginFormProps {
   onSuccess: () => void
@@ -45,6 +46,14 @@ export function LoginForm({ onSuccess, onToggleMode }: LoginFormProps) {
     }
   }
 
+  const handleOIDCLogin = async () => {
+    try {
+      await AuthService.loginWithOIDC()
+    } catch (err) {
+      setError("Failed to initialize SSO login.")
+    }
+  }
+
   return (
     <Card className="w-full max-w-md mx-auto">
       <CardHeader>
@@ -90,6 +99,20 @@ export function LoginForm({ onSuccess, onToggleMode }: LoginFormProps) {
             </Button>
           </form>
         </Form>
+
+        <div className="relative my-4">
+          <div className="absolute inset-0 flex items-center">
+            <Separator className="w-full" />
+          </div>
+          <div className="relative flex justify-center text-xs uppercase">
+            <span className="bg-background px-2 text-muted-foreground">Or continue with</span>
+          </div>
+        </div>
+
+        <Button variant="outline" type="button" className="w-full" onClick={handleOIDCLogin}>
+          Sign in with SSO
+        </Button>
+
         <div className="mt-4 text-center text-sm">
           Don't have an account?{" "}
           <button