Support using MCP tools in research mode

- Server admin can add MCP servers via the admin panel
- Enabled MCP server tools are exposed to the research agent for use
- Use MCP library to standardize interactions with mcp servers
  - Support SSE or Stdio as transport to interact with mcp servers
  - Reuse session established to MCP servers across research iterations

pyproject.toml

@@ -93,6 +93,7 @@ dependencies = [
     "resend == 1.0.1",
     "email-validator == 2.2.0",
     "e2b-code-interpreter ~= 1.0.0",
+    "mcp >= 1.12.4",
 ]
 dynamic = ["version"]