fix deployment: use config port, not $PORT

The MCP agent sets $PORT from the route, but the Podman port mapping
expects the container to listen on the config-defined port (3030).
Remove $PORT override to avoid the mismatch. Also restore ports,
network, and user fields in the service definition.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

main.go

@@ -6,7 +6,6 @@ import (
 	"log"
 	"net"
 	"net/http"
-	"os"
 
 	"git.wntrmute.dev/kyle/goutils/config"
 	"git.wntrmute.dev/kyle/goutils/die"
@@ -30,15 +29,10 @@ func main() {
 	srv := &server{db: db}
 	http.Handle("/", srv)
 
-	var addr string
-	if port := os.Getenv("PORT"); port != "" {
-		addr = ":" + port
-	} else {
-		addr = net.JoinHostPort(
-			config.Get("HTTP_ADDR"),
-			config.GetDefault("HTTP_PORT", "8000"),
-		)
-	}
+	addr := net.JoinHostPort(
+		config.Get("HTTP_ADDR"),
+		config.GetDefault("HTTP_PORT", "8000"),
+	)
 	log.Print("listening on ", addr)
 	log.Fatal(http.ListenAndServe(addr, nil))
 }