# Fix Runner Package Compilation Errors

The `go run .` command failed with compilation errors in the `runner` package.

## Errors Analysis
1.  **`runner/runner.go:8:2: "time" imported and not used`**:
    - The `time` package is imported but not used in `runner.go`.
2.  **`runner/runner.go:39:11: undefined: PythonRunner`**:
    - The code references `PythonRunner`, but it hasn't been defined/implemented yet (I only implemented Go, PHP, and Node).
3.  **`runner/go_runner.go:6:2: "fmt" imported and not used`**:
    - The `fmt` package is imported but not used in `go_runner.go`.

## Solution Plan
1.  **Modify `server/runner/runner.go`**:
    - Remove unused import `"time"`.
    - Remove the `case "python", "py":` block since `PythonRunner` is not implemented.
2.  **Modify `server/runner/go_runner.go`**:
    - Remove unused import `"fmt"`.

These changes will clean up the unused imports and remove the reference to the missing Python runner, allowing the server to compile.