feat: add MCP server for AI agent integration

Adds a Streamable HTTP MCP server at /mcp that exposes 19 tools
covering rundown entries, rundown management, runtime state, project
info, automations, and custom fields. Includes Bearer token auth
support and a UI card in Settings > Sharing showing the endpoint URL
and Claude Desktop config.

https://claude.ai/code/session_01U24MeuUacYXeQhbX3tatEe

apps/server/src/middleware/authenticate.ts

@@ -90,6 +90,14 @@ export function makeAuthenticateMiddleware(prefix: string) {
       }
     }
 
+    const authHeader = req.headers.authorization;
+    if (authHeader?.startsWith('Bearer ')) {
+      const bearerToken = authHeader.slice(7);
+      if (bearerToken === hashedPassword) {
+        return next();
+      }
+    }
+
     res.status(401).send('Unauthorized');
   }