refactor: rename API and frontend projects to Vocero

Rename the project directories, Python distribution and import package, and npm package. Update launcher, Docker, tooling, tests, lockfiles, and documentation while preserving existing API contracts.

Make AGENTS.md self-contained and remove external skill and workflow references.

vocero-api/server.py

@@ -0,0 +1,9 @@
+"""Compatibility entry point for existing ``uvicorn server:app`` deployments."""
+
+import sys
+from pathlib import Path
+
+# Also support --app-dir /path/to/vocero-api when launched outside the checkout.
+sys.path.insert(0, str(Path(__file__).resolve().parent))
+
+from vocero_api.main import app as app  # noqa: E402