Add profanity filter for subdomain validation

- Integrate github.com/TwiN/go-away for content filtering
- Check subdomains for inappropriate content during validation
- Update frontend to display 'inappropriate content' message
- Blocks profane subdomains from being claimed

Uses go-away's built-in profanity dictionary to detect:
- Leet speak substitutions (e.g., @73447h013)
- Obfuscated profanity
- Common inappropriate terms

internal/handlers/handlers.go

@@ -12,9 +12,12 @@ import (
 	"git.dws.rip/DWS/dyn/internal/database"
 	"git.dws.rip/DWS/dyn/internal/dns"
 	"git.dws.rip/DWS/dyn/internal/models"
+	"github.com/TwiN/go-away"
 	"github.com/gin-gonic/gin"
 )
 
+var profanityDetector = goaway.NewProfanityDetector()
+
 type WebHandler struct {
 	db     *database.DB
 	config *config.Config
@@ -49,6 +52,11 @@ func (h *WebHandler) ClaimSpace(c *gin.Context) {
 		return
 	}
 
+	if profanityDetector.IsProfane(subdomain) {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Subdomain contains inappropriate content"})
+		return
+	}
+
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 
@@ -86,6 +94,15 @@ func (h *WebHandler) CheckSubdomain(c *gin.Context) {
 		return
 	}
 
+	if profanityDetector.IsProfane(subdomain) {
+		c.JSON(http.StatusOK, gin.H{
+			"available": false,
+			"subdomain": subdomain,
+			"reason":    "inappropriate",
+		})
+		return
+	}
+
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()