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/worker-runtime/Cargo.toml

@@ -50,7 +50,7 @@ uuid = { workspace = true, features = ["v7"] }
 zeroize.workspace = true
 tower = { workspace = true, features = ["util"], optional = true }
 worker.workspace = true
-workspace-api = { path = "../workspace-api" }
+server-api = { path = "../server-api" }
 workdir.workspace = true
 
 [dev-dependencies]