feat: add max_model_len field for OpenFox compatibility

OpenFox looks for max_model_len in /v1/models response to determine
context window size. This commit:
- Adds max_model_len field to Jean models
- Adds max_model_len field to Ollama models
- Removes dead code after return statement

jean-router/app.py

@@ -119,19 +119,6 @@ def get_jean_context_lengths():
 
     return jean_ctx_cache
 
-    try:
-        url = f"http://{OLLAMA_PROXY_HOST}:{OLLAMA_PROXY_PORT}/api/tags"
-        r = requests.get(url, timeout=3)
-        if r.ok:
-            data = r.json().get("models", [])
-            ollama_cache["data"] = data
-            ollama_cache["timestamp"] = now
-            return data
-    except Exception as e:
-        log.warning(f"[Ollama] Erreur récupération: {e}")
-
-    return ollama_cache["data"]
-
 
 def get_active_preset():
     """Retourne le preset actuellement actif"""
@@ -394,6 +381,7 @@ def list_models():
             meta["context_length"] = ctx_len
             model_info["context_length"] = ctx_len
             model_info["context_window"] = ctx_len
+            model_info["max_model_len"] = ctx_len
 
         if meta:
             model_info["meta"] = meta
@@ -430,6 +418,7 @@ def list_models():
                 meta["context_length"] = ctx_len
                 model_info["context_length"] = ctx_len
                 model_info["context_window"] = ctx_len
+                model_info["max_model_len"] = ctx_len
             if m.get("capabilities"):
                 meta["capabilities"] = m["capabilities"]