fix: resolve customer-reported MCP tool failures (DSE-54632)

[Khauneesh-AI]

• Fix URL paths: use :restart/:stop instead of /restart//stop for restart_application, stop_application, stop_job_run
• Rewrite stop_model_deployment with correct path structure (models/{id}/builds/{id}/deployments/{id}:stop) and required params
• Rewrite log_experiment_run_batch and delete_experiment_run_batch with correct :logbatch/:deletebatch paths and run_id parameter
• Make create_application subdomain optional; auto-generate from name
• Remove get_runtimes_tool (broken, no pagination); improve list_runtimes_tool description to guide agents toward enabled runtimes
• HTTP server tools/list now dynamically exposes all registered tools via FastMCP instead of hardcoded 6; tools/call falls through to FastMCP for tools not in legacy dict
• Update tests for 104 tool count and list_runtimes_tool references