fix: read beatmapset count from osu!.db instead of iterating songs folder

src-tauri/Cargo.lock

@@ -475,8 +475,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "145052bdd345b87320e369255277e3fb5152762ad123a901ef5c262dd38fe8d2"
 dependencies = [
  "iana-time-zone",
+ "js-sys",
  "num-traits",
  "serde",
+ "wasm-bindgen",
  "windows-link 0.2.1",
 ]
 
@@ -995,6 +997,7 @@ dependencies = [
  "md5",
  "once_cell",
  "open",
+ "osynic_osudb",
  "reqwest",
  "serde",
  "serde_json",
@@ -2052,6 +2055,26 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "liblzma"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6033b77c21d1f56deeae8014eb9fbe7bdf1765185a6c508b5ca82eeaed7f899"
+dependencies = [
+ "liblzma-sys",
+]
+
+[[package]]
+name = "liblzma-sys"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9f2db66f3268487b5033077f266da6777d057949b8f93c8ad82e441df25e6186"
+dependencies = [
+ "cc",
+ "libc",
+ "pkg-config",
+]
+
 [[package]]
 name = "libredox"
 version = "0.1.12"
@@ -2262,6 +2285,15 @@ version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72ef4a56884ca558e5ddb05a1d1e7e1bfd9a68d9ed024c21704cc98872dae1bb"
 
+[[package]]
+name = "nom"
+version = "8.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df9761775871bdef83bee530e60050f7e54b1105350d6884eb0fb4f46c2f9405"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "ntapi"
 version = "0.4.2"
@@ -2605,6 +2637,18 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "osynic_osudb"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0d7f03567d97cdc0bf54380f0c525a00de1ce58ed9497f2409dfaf6112346b8a"
+dependencies = [
+ "chrono",
+ "liblzma",
+ "nom",
+ "serde",
+]
+
 [[package]]
 name = "pango"
 version = "0.18.3"