Harden TinyNode endpoint adapter to avoid route prefix drift

During interaction scanning, TPEN-services appears to call TinyNode CRUD routes with method/path conventions that may not match all other consumers (notably DEER using `/app/*`).

Suggested adjustment in TPEN-services:
1. Centralize TinyNode endpoint mapping in one adapter module.
2. Explicitly version or configure route prefix (`/app` vs root).
3. Add integration tests against TinyNode route contract.

This would reduce drift and make contract-seam checks easier to enforce.

Filed by automation as requested; label: `copilot`.