Feat: add gemini-2.5-pro-exp-03-25 (#6774)

### What problem does this PR solve?

#6733

### Type of change

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

conf/llm_factories.json

                     "llm_name": "gemini-2.0-flash-001",
                     "tags": "LLM,CHAT,1024K",
                     "max_tokens": 1048576,
-                    "model_type": "chat",
+                    "model_type": "image2text",
                     "is_tools": true
                 },
                 {
                     "max_tokens": 1048576,
                     "model_type": "image2text"
                 },
+                {
+                    "llm_name": "gemini-2.5-pro-exp-03-25",
+                    "tags": "LLM,IMAGE2TEXT,1024K",
+                    "max_tokens": 1048576,
+                    "model_type": "image2text"
+                },
                 {
                     "llm_name": "gemini-1.5-pro",
                     "tags": "LLM,IMAGE2TEXT,2048K",