feat(server): impl storage runtime (#15181)

#### PR Dependency Tree


* **PR #15181** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added an additional storage backend option: asset-pack based storage
(provider for avatar, blob, and copilot).
* Introduced a dedicated storage runtime with provider capability
reporting and expanded object operations (put/head/get/list/delete),
including presigned and multipart flows where supported.
* Cloudflare R2 `jurisdiction` now uses an explicit default when
omitted.
* **Bug Fixes**
  * Broadened avatar access to allow both fs and asset-pack providers.
* Improved workspace blob upload completion validation and handling when
stored objects are missing or mismatched.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/native/src/license.rs

@@ -1,7 +1,7 @@
 use std::{
   collections::HashMap,
   sync::{Mutex, OnceLock},
-  time::{Duration, SystemTime, UNIX_EPOCH},
+  time::{Duration, SystemTime},
 };
 
 use anyhow::{Context, Result as AnyResult, bail};
@@ -458,10 +458,7 @@ fn parse_future_end_at(value: &serde_json::Value) -> AnyResult<f64> {
 }
 
 fn now_millis() -> f64 {
-  SystemTime::now()
-    .duration_since(UNIX_EPOCH)
-    .unwrap_or_default()
-    .as_millis() as f64
+  crate::utils::system_time_millis(SystemTime::now()).unwrap_or_default() as f64
 }
 
 fn affine_pro_ech_config() -> AnyResult<Vec<u8>> {