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

go.mod

@@ -1,6 +1,6 @@
 module git.dws.rip/DWS/dyn
 
-go 1.23.0
+go 1.24.4
 
 require (
 	github.com/gin-gonic/gin v1.11.0
@@ -8,6 +8,7 @@ require (
 )
 
 require (
+	github.com/TwiN/go-away v1.8.1 // indirect
 	github.com/bytedance/sonic v1.14.0 // indirect
 	github.com/bytedance/sonic/loader v0.3.0 // indirect
 	github.com/cloudwego/base64x v0.1.6 // indirect
@@ -31,12 +32,12 @@ require (
 	github.com/ugorji/go/codec v1.3.0 // indirect
 	go.uber.org/mock v0.5.0 // indirect
 	golang.org/x/arch v0.20.0 // indirect
-	golang.org/x/crypto v0.40.0 // indirect
-	golang.org/x/mod v0.25.0 // indirect
-	golang.org/x/net v0.42.0 // indirect
-	golang.org/x/sync v0.16.0 // indirect
-	golang.org/x/sys v0.35.0 // indirect
-	golang.org/x/text v0.27.0 // indirect
-	golang.org/x/tools v0.34.0 // indirect
+	golang.org/x/crypto v0.42.0 // indirect
+	golang.org/x/mod v0.28.0 // indirect
+	golang.org/x/net v0.44.0 // indirect
+	golang.org/x/sync v0.17.0 // indirect
+	golang.org/x/sys v0.36.0 // indirect
+	golang.org/x/text v0.30.0 // indirect
+	golang.org/x/tools v0.37.0 // indirect
 	google.golang.org/protobuf v1.36.9 // indirect
 )