Move TG LLM classifier to Go

.env.example

@@ -41,6 +41,7 @@ LLM_MODEL=qwen2.5-14b
 LLM_TIMEOUT_SECONDS=120
 LLM_MAX_TOKENS=600
 LLM_MIN_TEXT_LENGTH=20
+LLM_CLASSIFIER_OWNER=python
 # How often the background classifier wakes up and how many messages it
 # processes per tick. With 5/20s ≈ 900 messages/hour at ~3-6s per call.
 LLM_CLASSIFY_INTERVAL_SECONDS=20