feat: make Ollama model configurable via OLLAMA_MODEL env var

- Add OLLAMA_MODEL setting to shared config (default: qwen3:32b)
- LLM router reads from settings instead of hardcoded model name
- Create .env file with all configurable settings documented
- docker-compose passes OLLAMA_MODEL to llm-pool container

To change the model: edit OLLAMA_MODEL in .env and restart llm-pool.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/llm-pool/llm_pool/router.py

@@ -32,7 +32,7 @@ _model_list: list[dict] = [
     {
         "model_name": "local",
         "litellm_params": {
-            "model": "ollama/qwen3:32b",
+            "model": f"ollama/{settings.ollama_model}",
             "api_base": settings.ollama_base_url,
         },
     },
@@ -40,7 +40,7 @@ _model_list: list[dict] = [
     {
         "model_name": "fast",
         "litellm_params": {
-            "model": "ollama/qwen3:32b",
+            "model": f"ollama/{settings.ollama_model}",
             "api_base": settings.ollama_base_url,
         },
     },
@@ -48,7 +48,7 @@ _model_list: list[dict] = [
     {
         "model_name": "economy",
         "litellm_params": {
-            "model": "ollama/qwen3:32b",
+            "model": f"ollama/{settings.ollama_model}",
             "api_base": settings.ollama_base_url,
         },
     },
@@ -56,7 +56,7 @@ _model_list: list[dict] = [
     {
         "model_name": "balanced",
         "litellm_params": {
-            "model": "ollama/qwen3:32b",
+            "model": f"ollama/{settings.ollama_model}",
             "api_base": settings.ollama_base_url,
         },
     },