add flutter feature and rename mobile to flutter

Cargo.toml

@@ -22,7 +22,8 @@ cli = []
 use_samplerate = ["samplerate"]
 use_rubato = ["rubato"]
 use_dasp = ["dasp"]
-default = ["use_dasp"]
+flutter = ["flutter_rust_bridge"]
+default = ["use_dasp","flutter"]
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -52,6 +53,7 @@ rpassword = "6.0"
 base64 = "0.13"
 sysinfo = "0.23"
 num_cpus = "1.13"
+flutter_rust_bridge = { version = "1.30.0", optional = true }
 
 [target.'cfg(not(target_os = "linux"))'.dependencies]
 reqwest = { version = "0.11", features = ["json", "rustls-tls"], default-features=false }
@@ -99,7 +101,7 @@ async-process = "1.3"
 android_logger = "0.11"
 jni = "0.19.0"
 
-[target.'cfg(any(target_os = "android", target_os = "ios", target_os = "linux"))'.dependencies]
+[target.'cfg(any(target_os = "android", target_os = "ios"))'.dependencies]
 flutter_rust_bridge = "1.30.0"
 
 [workspace]