chore(prefetch): rename workspace crate

Cargo.toml

@@ -12,7 +12,7 @@
 #   crates/chanora_audio/        — capture, DSP, Opus, jitter, mixer
 #   crates/chanora_storage/      — bookmarks, settings, identity refs
 #   crates/chanora_diagnostics/  — logs, redaction, export
-#   crates/chanora_server_prefetch — server-resolution prefetch cache/policy
+#   crates/chanora_prefetch — server-resolution prefetch cache/policy
 #   crates/chanora_bridge/       — Flutter/Rust typed DTOs + glue
 #
 # The Flutter app is not part of this Cargo workspace; it is owned by
@@ -31,7 +31,7 @@ members = [
     "crates/chanora_audio",
     "crates/chanora_storage",
     "crates/chanora_diagnostics",
-    "crates/chanora_server_prefetch",
+    "crates/chanora_prefetch",
     "crates/chanora_bridge",
     "crates/chanora_resolver",
 ]