chore: trim unnecessary Arti features to reduce binary size

- Set default-features = false on arti-client and tor-rtcompat
- Removed bridge-client (UI doesn't expose bridge config yet)
- Narrowed tokio features from "full" to only what the SOCKS proxy
  needs: rt-multi-thread, net, io-util, time, macros

Kept: tokio, rustls, compression, onion-service-client, static-sqlite
(all required for Amethyst's .onion relay support)

https://claude.ai/code/session_01BApgDd5udqBzMqysSRMpZu

tools/arti-build/Cargo.toml

@@ -9,17 +9,16 @@ crate-type = ["cdylib"]
 [workspace]
 
 [dependencies]
-arti-client = { version = "0.38", features = [
+arti-client = { version = "0.38", default-features = false, features = [
     "tokio",
     "rustls",
     "compression",
-    "bridge-client",
     "onion-service-client",
     "static-sqlite",
 ] }
-tor-rtcompat = { version = "0.38", features = ["tokio", "rustls"] }
+tor-rtcompat = { version = "0.38", default-features = false, features = ["tokio", "rustls"] }
 jni = "0.21"
-tokio = { version = "1", features = ["full"] }
+tokio = { version = "1", features = ["rt-multi-thread", "net", "io-util", "time", "macros"] }
 anyhow = "1"
 
 [profile.release]