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✅ test: Add forwarder integration tests

Implement 7 comprehensive integration tests for the Forwarder package to verify
core port-forwarding logic, retry behavior, and graceful shutdown.

## Tests Added

**Integration Tests** (internal/forwarder/forwarder_test.go)
1. **TestForwarderStartWithValidPod** - Happy path: pod located successfully
2. **TestForwarderLocatorError** - Retry behavior when locator fails (pod not found)
3. **TestForwarderRetryAttemptIncrement** - Verify attempt counter increments on failures
4. **TestForwarderContextCancellation** - Graceful shutdown on context cancellation
5. **TestForwarderInfoString** - Forwarder info formatting for logs
6. **TestForwarderCalculateBackoff** - Exponential backoff calculation with max delay enforcement
7. **TestForwarderConfig** - Config getter method verification