feat: implement TTL cache for message deduplication and remove debug logging

- Replace manual map-based deduplication with jellydator/ttlcache/v3
- Add automatic cache eviction with 30-second TTL to prevent memory bloat
- Implement proper cache lifecycle management (start/stop)
- Remove emoji debug logs from bridge system and XMPP client
- Clean up verbose logging while maintaining essential error handling
- Update bridge interface method names for consistency

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

go.mod

@@ -102,6 +102,7 @@ require (
 	github.com/hashicorp/yamux v0.1.2 // indirect
 	github.com/hexops/gotextdiff v1.0.3 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/jellydator/ttlcache/v3 v3.4.0 // indirect
 	github.com/jgautheron/goconst v1.7.1 // indirect
 	github.com/jingyugao/rowserrcheck v1.1.1 // indirect
 	github.com/jirfag/go-printf-func-name v0.0.0-20200119135958-7558a9eaa5af // indirect
@@ -210,7 +211,7 @@ require (
 	golang.org/x/exp/typeparams v0.0.0-20240314144324-c7f7c6466f7f // indirect
 	golang.org/x/mod v0.22.0 // indirect
 	golang.org/x/net v0.34.0 // indirect
-	golang.org/x/sync v0.10.0 // indirect
+	golang.org/x/sync v0.15.0 // indirect
 	golang.org/x/sys v0.29.0 // indirect
 	golang.org/x/term v0.28.0 // indirect
 	golang.org/x/text v0.21.0 // indirect