Feat: add Qwen3-Embedding text-embedding-v4 (#8184)

### What problem does this PR solve?

Add Qwen3-Embedding text-embedding-v4.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

conf/llm_factories.json

@@ -360,6 +360,12 @@
                     "max_tokens": 8192,
                     "model_type": "embedding"
                 },
+                {
+                    "llm_name": "text-embedding-v4",
+                    "tags": "TEXT EMBEDDING,8K",
+                    "max_tokens": 8192,
+                    "model_type": "embedding"
+                },
                 {
                     "llm_name": "qwen-vl-max",
                     "tags": "LLM,CHAT,IMAGE2TEXT",