Fix MCP OAuth auth commands to recognize remote servers by default

[shamil2]

Fixes issue where MCP OAuth authentication commands didn't recognize remote MCP servers as OAuth-enabled unless explicitly configured with 'oauth' in the config.

Changes

• Updated CLI MCP list and auth commands to use MCP.supportsOAuth() function
• Remote MCP servers now support OAuth by default (matching server behavior)
• No longer requires explicit 'oauth' config for remote servers to be OAuth-enabled

Root Cause

The CLI was checking !!cfg.oauth but the server enables OAuth for remote servers by default unless oauth: false. This created a mismatch where servers would accept OAuth but the CLI wouldn't show them as OAuth-capable.

Closes #5444

[rekram1-node]

/review

[rekram1-node]

looks like there are some type errors

[klaudworks]

@shamil2 will you fix this? o.w. I'll open a new PR

[rekram1-node]

still has type errors @shamil2