Convex MCP server

## Log Streaming ### Concepts `LogManager`: the main router/aggregation point for logging events. `LogSource`: a source that creates and buffers logs for the `LogManager` to query. `LogSink`: a dynamically-attachable log receiver. Subscribes to `LogManager`. ### Adding a new LogSink See `sinks/datadog.rs` for an example of a simple sink. The following steps are necessary: 1. Write the sink implementation which implements `LogSink` in `sinks/` 2. Provide a `start` method that configures your sink and returns a `LogSinkClient`. This is how the `LogManager` communicates with your `LogSink` and is able to send it events. 3. Create a backend endpoint similar to `/api/datadog_integration` which accepts a `post` method to create the integration. This should collect the necessary configuration parameters and update the `_log_sinks` table. 4. Add a new `LogSinkType` and `LogSinkConfig` with an associated configuration with an associated config which can be stores in the DB model. 5. Update the switch in `LogManager::config_to_log_sink_client` to call `start` on your `LogSink` with the necessary configuration params. 6. If configured correctly, now the `LogManager` will forward logs to your sink once the sink is configured and subscribed to!