feat: Add RFT MCP integration

[d42me]

Closes ENG-2416

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Note

Introduces RL (RFT) capabilities to the MCP and extends the HTTP client.

• Adds new prime_mcp.tools.rl with wrappers for RFT endpoints: models, runs (list/get/create/stop/delete/logs), and adapters (list/get/delete)
• Exposes these as MCP tools in mcp.py (list_rl_models, list_rl_runs, get_rl_run, create_rl_run, stop_rl_run, delete_rl_run, get_rl_run_logs, list_rl_adapters, get_rl_adapter, delete_rl_adapter)
• Enhances HTTP client to support PUT in both AsyncAPIClient and make_prime_request

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