Add worker health endpoints

internal/config/config.go

@@ -26,6 +26,8 @@ type Config struct {
 	AIStatsTimeout      time.Duration
 
 	WorkerID            string
+	WorkerHTTPHost      string
+	WorkerHTTPPort      int
 	WorkerPollInterval  time.Duration
 	WorkerClaimLimit    int
 	WorkerLeaseTimeout  time.Duration
@@ -53,6 +55,8 @@ func Load() Config {
 		AIStatsTimeout:      envDuration("AI_STATS_TIMEOUT", 8*time.Second),
 
 		WorkerID:            envString("WORKER_ID", hostname()),
+		WorkerHTTPHost:      envString("WORKER_HTTP_HOST", "0.0.0.0"),
+		WorkerHTTPPort:      envInt("WORKER_HTTP_PORT", 8081),
 		WorkerPollInterval:  envDuration("WORKER_POLL_INTERVAL", 2*time.Second),
 		WorkerClaimLimit:    envInt("WORKER_CLAIM_LIMIT", 4),
 		WorkerLeaseTimeout:  envDuration("WORKER_LEASE_TIMEOUT", 15*time.Minute),