Add a new "Authentication Headers" panel to AgentFormFields:
- Static Headers: key-value Form.List (always sent to the backend agent,
static wins on conflict with dynamic)
- Forward Client Headers: Select[tags] of header names to extract from
the client request and forward (extra_headers)
Update buildAgentDataFromForm to serialize both fields for the API.
Update parseAgentForForm to deserialize them back for editing.
Covers both the create wizard (add_agent_form) and the edit view (agent_info).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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