feat: add statistics API and dashboard for asset metrics

- Implemented `/api/stats` endpoint to return JSON metrics including active assets, total uploads, storage usage, and recent activity.
- Created `stats.html` page to display real-time statistics with auto-refresh functionality.
- Enhanced asset logging to include uploader IP and detailed event information for uploads and deletions.
- Updated asset model to store uploader IP for audit purposes.
- Improved logging functionality to ensure log directory exists before writing.
- Refactored asset creation and management to support new features and logging.

src/main.rs

@@ -10,9 +10,9 @@ use actix_web::{
 use serde_json::Value;
 use std::{env, fs, path::PathBuf, sync::LazyLock};
 
-pub static HTML_DIR: &str = "html/";
-pub static LOG_DIR: &str = "logs/";
-pub static DATA_STORAGE: &str = "storage/";
+pub static HTML_DIR: &str = "data/html/";
+pub static LOG_DIR: &str = "data/logs/";
+pub static DATA_STORAGE: &str = "data/storage/";
 
 pub static BIND_ADDR: LazyLock<String> = LazyLock::new(|| match env::var("BIND_ADDR") {
     Ok(addr) => {
@@ -43,7 +43,7 @@ pub static STATIC_PAGES: LazyLock<Vec<String>> = LazyLock::new(|| {
 });
 
 use crate::{
-    api::{api_get_asset, api_upload},
+    api::{api_get_asset, api_stats, api_upload},
     logs::log_to_file,
 };
 
@@ -102,6 +102,7 @@ async fn main() -> std::io::Result<()> {
             .service(view_asset)
             .service(api_get_asset)
             .service(api_upload)
+            .service(api_stats)
             .service(catch_all)
     })
     .bind((BIND_ADDR.clone(), *BIND_PORT))?