implemented save file compression in browser

src/config/AppConfig.ts

@@ -5,9 +5,19 @@ export const defaultConfig = {
         saveParserBackend: {
             url: 'http://127.0.0.1:5226',
         },
-        // TODO: implement auth api
-        auth: {},
+    },
+    saveUpload: {
+        // Size of a save if it is uploaded as uncompressed. The browser packs
+        // saves as a stream, so these limits are about the backend's disk
+        // rather than about memory.
+        maxSizePlainTextBytes: 200 * 1024 * 1024,
+        // Archives produced by the game, recognized by the zip magic bytes.
+        maxSizeCompressedBytes: 60 * 1024 * 1024,
+        // read COMPRESSION.md
+        zstdCompressionLevel: 11,
     },
 }
 
 export type AppConfig = typeof defaultConfig
+
+export type SaveUploadConfig = AppConfig['saveUpload']