Baseline: full tree snapshot after git repository loss

The previous .git directory was found gutted (only info/ remained), so
history is unrecoverable locally. This commit restores version control
with the tree exactly as it stands: the working app, the preview-tracks
launcher on the artist hero, the scrollable-track-previews design bundle
(docs + approved mockups), and the Phase 0 validation artifacts.

crates/soulseek-proto/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "soulseek-proto"
+version.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+bytes.workspace = true
+thiserror.workspace = true
+flate2 = "1"
+md-5 = "0.10"