feat: add web push and sadhna tracker

internal/config/config.go

@@ -89,6 +89,14 @@ type Config struct {
 	SoketiHost      string
 	SoketiPort      int
 	SoketiUseTLS    bool
+
+	// Web Push (VAPID). Empty keys disable push delivery (other channels
+	// still run). VAPIDSubject is a mailto: or https: contact URL required
+	// by the spec. The public key is also served to the browser to
+	// subscribe.
+	VAPIDPublicKey  string
+	VAPIDPrivateKey string
+	VAPIDSubject    string
 }
 
 // Load reads configuration from environment variables (with .env fallback).
@@ -154,6 +162,10 @@ func Load() (*Config, error) {
 		SoketiHost:      getEnv("SOKETI_HOST", "ws.prabhupadasays.org"),
 		SoketiPort:      getEnvInt("SOKETI_PORT", 443),
 		SoketiUseTLS:    getEnvBool("SOKETI_USE_TLS", true),
+
+		VAPIDPublicKey:  getEnv("VAPID_PUBLIC_KEY", ""),
+		VAPIDPrivateKey: getEnv("VAPID_PRIVATE_KEY", ""),
+		VAPIDSubject:    getEnv("VAPID_SUBJECT", "mailto:admin@prabhupadasays.org"),
 	}
 
 	if cfg.MongoURI == "" {