Read an entitlement snapshot

{
    "endpoint": "GET /v1/entitlements",
    "snapshot": {
        "userID": "local-user-001",
        "plan": "pro",
        "allowedModes": [
            "voiceInput",
            "translation",
            "rewrite"
        ],
        "remainingQuotaSeconds": 7200,
        "remainingAddonSeconds": 600,
        "asOf": "2026-04-01T16:20:00Z",
        "totalRemainingSeconds": 7800
    }
}