Expose available tools via a GET /api/v1/tools endpoint

[alimaandev]

Summary

The tool registry (core/registry.py) discovers and stores tool definitions in _TOOL_DEFINITIONS, exposed through get_tool_definitions() (line ~177). The frontend has no way to list which tools Friday currently knows about.

Goal

Add a read-only GET /api/v1/tools endpoint in desktop/api_server.py that returns the list of tool names + descriptions from core.registry.get_tool_definitions().

Tasks

• Add the route with @require_auth
• Return { tools: [{name, description}] }
• Add tests in ests/test_api_server.py under a new TestTools class

Acceptance criteria

• GET /api/v1/tools returns discovered tools after discover_plugins()
• Unauthenticated request is rejected (401)
• Tests cover both success and auth-failure paths

Labels

good first issue, help wanted