fix: strip Ollama-style tag suffix from LocalAI model names (#15908)

## Summary

LocalAI exposes two API surfaces with conflicting naming conventions:
- `GET /api/tags` returns model names with `:latest` suffix (Ollama
format)
- `POST /v1/chat/completions` expects names without `:latest` (OpenAI
format)

RAGFlow discovered models via `/api/tags` and stored the tagged name,
then used it with `/v1/chat/completions`, causing a 404 error because
LocalAI didn't recognize `model:latest`.

## Fix

In `LocalAI.get_model_list()`, strip the tag suffix from model names
using `model["name"].rsplit(":", 1)[0]`, so stored names match what the
OpenAI-compatible endpoints expect.

rag/llm/model_meta.py

@@ -259,7 +259,7 @@ class LocalAI(Base):
                     context_length = model_info.get("model_info", {}).get("general.context_length", 8192)
                     res.append(
                         {
-                            "name": model["name"],
+                            "name": model["name"].rsplit(":", 1)[0],
                             "model_types": [capability_to_model_type_mapping[c] for c in model_info.get("capabilities", []) if c in capability_to_model_type_mapping],
                             "features": [capability_to_feature_mapping[c] for c in model_info.get("capabilities", []) if c in capability_to_feature_mapping],
                             "max_tokens": context_length or 8192,