feat(adapter): 云端视觉适配器 + role 角色区分

- base_adapter 增加 role 字段(vision/text)与 get_role()
- gemini_adapter 修复 v1beta 下模型名 404(gemini-1.5-flash→gemini-flash-latest), 改逐帧调用
- 新增 nvidia_adapter(openai SDK, 规避 NIM 单次限 1 图逐帧), 注册 adapter_factory
- 视觉分析仅 vision 角色参与, 文本融合交给 role=text 模型

fam-edge/src/fam_edge/model_adapters/adapter_factory.py

@@ -11,6 +11,7 @@ from typing import List
 from .base_adapter import BaseModelAdapter
 from .ollama_adapter import OllamaAdapter
 from .gemini_adapter import GeminiAdapter
+from .nvidia_adapter import NvidiaVisionAdapter
 from ..logger import setup_logger
 
 logger = setup_logger('fam-edge.adapter_factory')
@@ -18,9 +19,7 @@ logger = setup_logger('fam-edge.adapter_factory')
 _ADAPTER_REGISTRY = {
     "ollama": OllamaAdapter,
     "gemini": GeminiAdapter,
-    # v1.1 扩展:
-    # "openai": OpenAIAdapter,
-    # "nvidia": NvidiaAdapter,
+    "nvidia": NvidiaVisionAdapter,
 }