Add tantivy, moka, tonic workspace dependencies for Week 8 search

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/claude-agent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

musicfs/Cargo.toml

@@ -62,3 +62,18 @@ tempfile = "3"
 
 # Platform-specific
 libc = "0.2"
+
+# Search (Week 8)
+tantivy = "0.22"
+moka = { version = "0.12", features = ["sync"] }
+
+# Concurrency
+parking_lot = "0.12"
+
+# gRPC (Week 8)
+tonic = "0.11"
+prost = "0.12"
+tokio-stream = "0.1"
+
+[workspace.dependencies.tonic-build]
+version = "0.11"