fix: remove duplicate endpoints.ts, fix Login imports

- Remove web/src/api/endpoints.ts (redundant with index.ts)
- Fix Login.tsx to use useLogin hook
- Simplify Dockerfile (use CI-built artifacts)

web/src/pages/Login.tsx

@@ -1,27 +1,24 @@
 import { useState } from 'react'
 import { useNavigate } from '@tanstack/react-router'
-import { login } from '@/api/endpoints'
+import { useLogin } from '@/api/hooks'
 import { Lock, User, AlertCircle } from 'lucide-react'
 
 export default function Login() {
   const navigate = useNavigate()
+  const loginMutation = useLogin()
   const [username, setUsername] = useState('')
   const [password, setPassword] = useState('')
   const [error, setError] = useState('')
-  const [loading, setLoading] = useState(false)
 
   const handleSubmit = async (e: React.FormEvent) => {
     e.preventDefault()
     setError('')
-    setLoading(true)
 
     try {
-      await login(username, password)
+      await loginMutation.mutateAsync({ username, password })
       navigate({ to: '/' })
     } catch (err: any) {
       setError(err.message || 'Login failed')
-    } finally {
-      setLoading(false)
     }
   }
 
@@ -130,7 +127,7 @@ export default function Login() {
 
           <button
             type="submit"
-            disabled={loading}
+            disabled={loginMutation.isPending}
             style={{
               width: '100%',
               padding: 12,
@@ -140,11 +137,11 @@ export default function Login() {
               color: 'white',
               fontSize: 14,
               fontWeight: 500,
-              cursor: loading ? 'not-allowed' : 'pointer',
-              opacity: loading ? 0.7 : 1,
+              cursor: loginMutation.isPending ? 'not-allowed' : 'pointer',
+              opacity: loginMutation.isPending ? 0.7 : 1,
             }}
           >
-            {loading ? 'Signing in...' : 'Sign In'}
+            {loginMutation.isPending ? 'Signing in...' : 'Sign In'}
           </button>
         </form>
       </div>