Standardize demo configs and CLI templates to v0.3.0

- Update all demo config files to version v0.3.0
- Rename llm_providers → model_providers across all configs
- Modernize listener format from object to array style
  (e.g. listeners: [{type: model, name:, port:}])
- Replace chatbot_ui with AnythingLLM in 6 docker-compose files
- Remove prometheus/grafana services from llm_gateway and
  preference_based_routing docker-compose files
- Add tracing: random_sampling: 100 to configs that lacked it
- Update 3 CLI init templates (coding_agent_routing,
  preference_aware_routing, conversational_state_v1_responses)
- Fix test_init.py assertion for model_providers key

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cli/test/test_init.py

@@ -26,7 +26,7 @@ def test_init_template_builtin_writes_config(tmp_path, monkeypatch):
     config_path = tmp_path / "config.yaml"
     assert config_path.exists()
     config_text = config_path.read_text(encoding="utf-8")
-    assert "llm_providers:" in config_text
+    assert "model_providers:" in config_text
 
 
 def test_init_refuses_overwrite_without_force(tmp_path, monkeypatch):