Check, Fix, Optimize and Update README

[Cylae]

This PR addresses the "Check. Fix. Optimize." task.

Changes:

1. Optimization (Caching & Async):

   • Refactored server_manager/src/core/config.rs and server_manager/src/core/users.rs to use static OnceLock<RwLock<Cached...>> caches.
   • Implemented 500ms throttling on load_async metadata checks to reduce I/O.
   • Added proper async methods (add_user_async, enable_service_async, etc.) that offload blocking operations (file I/O, system user creation, hashing) to tokio::task::spawn_blocking.
   • Refactored server_manager/src/interface/web.rs to remove local caches and block_in_place, utilizing the new thread-safe, efficient core methods.

2. Fixes:

   • Added sys.refresh_disks() in HardwareInfo::detect to ensuring disk space usage is populated.
   • Unified path logic in UserManager for consistency between load and save.

3. Documentation:

   • Updated README.md to reflect version 1.0.8.
   • Bumped Cargo.toml version.

Verification:

• Ran cargo test - All tests passed.
• Ran cargo clippy - No warnings in project code.
• Verified compilation with cargo check.

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PR created automatically by Jules for task 1266073415750486465 started by @Cylae

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