refactor: remove stream smoothing config from system settings and improve base image caching

- Remove stream_smoothing configuration from SystemConfigService (moved to handler default)
- Remove stream smoothing UI controls from admin settings page
- Add AdminClearSingleAffinityAdapter for targeted cache invalidation
- Add clearSingleAffinity API endpoint to clear specific affinity cache entries
- Include global_model_id in affinity list response for UI deletion support
- Improve CI/CD workflow with hash-based base image change detection
- Add hash label to base image for reliable cache invalidation detection
- Use remote image inspection to determine if base image rebuild is needed
- Include Dockerfile.base in hash calculation for proper dependency tracking

src/services/system/config.py

@@ -78,19 +78,6 @@ class SystemConfigService:
             "value": False,
             "description": "是否自动删除过期的API Key（True=物理删除，False=仅禁用），仅管理员可配置",
         },
-        # 流式平滑输出配置
-        "stream_smoothing_enabled": {
-            "value": False,
-            "description": "是否启用流式平滑输出，自动根据文本长度调整输出速度",
-        },
-        "stream_smoothing_chunk_size": {
-            "value": 20,
-            "description": "流式平滑输出每个小块的字符数",
-        },
-        "stream_smoothing_delay_ms": {
-            "value": 8,
-            "description": "流式平滑输出每个小块之间的延迟毫秒数",
-        },
     }
 
     @classmethod