feat(compression): add zlib compression for scene files and image optimization

- Add flate2 dependency for zlib compression support in Rust backend
- Implement compressed scene file format with magic number (PURGIFZ1) for format detection
- Add backward compatibility for loading uncompressed legacy scene files
- Convert scene JSON to compact format (no indentation) to reduce file size
- Add image compression utilities with configurable quality and dimensions
- Implement image size detection and compression necessity checking
- Add helper functions for base64 image size calculation and MIME type detection
- Disable global Tauri object in web context for security
- Reduce memory footprint for large scene files and high-resolution images through compression

src-tauri/tauri.conf.json

@@ -25,7 +25,8 @@
     ],
     "security": {
       "csp": null
-    }
+    },
+    "withGlobalTauri": false
   },
   "bundle": {
     "active": true,