* feat: add useAgentCapabilities hook to manage agent capabilities
* refactor: move agents and endpoints configuration to AgentPanel context provider
* refactor: implement useGetAgentsConfig hook for consolidated agents and endpoints management
* refactor: enhance ToolsDropdown to utilize agent capabilities and streamline dropdown item rendering
* chore: reorder return values in useAgentCapabilities for improved clarity
* refactor: enhance agent capabilities handling in AttachFileMenu and update file handling logic to allow capabilities to be used for non-agents endpoints
