fix: restore TrackUsage and CheckAndTrack for build success

internal/handler/keys.go

@@ -7,7 +7,7 @@ import (
     "os"
     "sync"
 )
-type KeyData struct { Name string; Key string; Tokens int }
+type KeyData struct { Name string; Key string; Requests int; Tokens int }
 type Store struct { mu sync.Mutex; Keys map[string]*KeyData }
 var s = &Store{Keys: make(map[string]*KeyData)}
 const p = "/data/keys.json"
@@ -18,6 +18,17 @@ func init() {
     if s.Keys == nil { s.Keys = make(map[string]*KeyData) }
 }
 func save() { b, _ := json.Marshal(s.Keys); os.WriteFile(p, b, 0644) }
+// FUNCIONES QUE FALTABAN PARA EL BUILD
+func TrackUsage(k string, t int) {
+    s.mu.Lock(); defer s.mu.Unlock()
+    if kd, ok := s.Keys[k]; ok { kd.Requests++; kd.Tokens += t; save() }
+}
+func CheckAndTrack(k string, t int) (bool, string) {
+    if k == "free" { return true, "" }
+    s.mu.Lock(); defer s.mu.Unlock()
+    if _, ok := s.Keys[k]; ok { return true, "" }
+    return false, "Key invalida"
+}
 func GenerateKey(n string) string {
     k := fmt.Sprintf("RWPX-%d", rand.Intn(999999))
     s.mu.Lock(); defer s.mu.Unlock()
@@ -38,7 +49,8 @@ func HandleSecretReveal(w http.ResponseWriter, r *http.Request) {
     if r.URL.Query().Get("pass") != "RWPX_S3cr3t_M0d3_#2026_NzQ!" { w.WriteHeader(403); return }
     s.mu.Lock(); defer s.mu.Unlock()
     w.Header().Set("Content-Type", "text/html")
-    fmt.Fprint(w, "<html><body style='background:#000;color:#0f0;font-family:monospace;'>")
-    for _, k := range s.Keys { fmt.Fprintf(w, "<p>%s: %s</p>", k.Name, k.Key) }
+    fmt.Fprint(w, "<html><body style='background:#000;color:#0f0;font-family:monospace;padding:20px;'>")
+    fmt.Fprint(w, "<h2>MU/TH/UR 6000 - MASTER ACCESS</h2><hr>")
+    for _, k := range s.Keys { fmt.Fprintf(w, "<p>%s: <code>%s</code></p>", k.Name, k.Key) }
     fmt.Fprint(w, "</body></html>")
 }