docs: update Anthropic console URLs to platform.claude.com

Anthropic migrated their developer console from console.anthropic.com
to platform.claude.com. Two user-facing display URLs were still pointing
to the old domain:

- hermes_cli/main.py — API key prompt in the Anthropic model flow
- run_agent.py — 401 troubleshooting output

The OAuth token refresh endpoint was already migrated in PR #3246
(with fallback).

Spotted by @LucidPaths in PR #3237.

(Salvage of #3758 — dropped the setup.py hunk since that section was
refactored away and no longer contains the stale URL.)

hermes_cli/main.py

@@ -3973,7 +3973,7 @@ def _model_flow_anthropic(config, current_model=""):
 
         elif choice == "2":
             print()
-            print("  Get an API key at: https://console.anthropic.com/settings/keys")
+            print("  Get an API key at: https://platform.claude.com/settings/keys")
             print()
             try:
                 import getpass