refactor(api): rename workspace-api authority to server-api

Absorb the Server HTTP DTO catalog and generators into server-api, remove the obsolete workspace-api package/path, preserve the separate runtime transport authority through explicit boundary DTO conversions, and rename the aggregate frontend projection as a bounded legacy artifact.

crates/workdir/Cargo.toml

@@ -19,7 +19,6 @@ sha2.workspace = true
 tempfile.workspace = true
 thiserror.workspace = true
 tokio = { workspace = true, features = ["process", "rt", "sync", "time"] }
-workspace-api = { workspace = true }
 
 [dev-dependencies]
 serde_json.workspace = true