fix: 图生视频节点进度解析兼容百分号格式，K26/K3/Seedance统一走cf-api异步接口，K26新增seed参数

- 修复 K_video_image2video.py 进度值 "10%" 解析报错：rstrip('%') 后 float→int 安全转换
- K26 节点拆分为图生视频/首尾帧两个独立节点，删除旧的合并节点 K_video.py
- K26/K3 视频节点及 Seedance 客户端统一改用 get_async_api_base_url (cf-api.o1key.com)
- K3 节点模式选项从 标准/专家 改为 720p/1080p，与后端一致
- K_video_image2video.py 和 K_video_firstlast.py 新增 ComfyUI 原生 seed 参数

Co-Authored-By: Claude Opus 4.6 <[email protected]>

nodes/K3_video.py

@@ -11,7 +11,7 @@ import tempfile
 
 import aiohttp
 
-from ..utils.config import get_api_key_or_raise, get_api_base_url
+from ..utils.config import get_api_key_or_raise, get_async_api_base_url
 from ..utils.image_utils import tensor_to_pil, encode_image_to_base64
 
 try:
@@ -25,8 +25,8 @@ except Exception:
 # ── 常量 ──────────────────────────────────────────────────────────────────────
 
 _MODEL_BASE = "kling-v3"          # 动态拼接为 kling-v3-{模式}-{时长}s-{voice}
-_MODES      = ["标准", "专家", "4K"]
-_MODE_MAP   = {"标准": "std", "专家": "pro", "4K": "4k"}
+_MODES      = ["720p", "1080p", "4K"]
+_MODE_MAP   = {"720p": "std", "1080p": "pro", "4K": "4k"}
 
 _MULTI_SHOT_OPTIONS = [
     "禁用",
@@ -112,7 +112,7 @@ class K3Video:
             "负向提示词": ("STRING", {"multiline": True, "default": ""}),
             "时长":      ([5, 10, 15], {"default": 5}),
             "生成音频":  (["关闭", "打开"], {"default": "关闭"}),
-            "模式":      (_MODES, {"default": "标准"}),
+            "模式":      (_MODES, {"default": "720p"}),
             "seed": ("INT", {
                 "default": 0, "min": 0, "max": 2147483647,
                 "tooltip": "seed 仅控制节点是否重新运行，结果本身不可复现。",
@@ -139,7 +139,7 @@ class K3Video:
 
     async def generate(self, 多镜头, 起始帧, 提示词, 负向提示词, 时长, 生成音频, 模式, seed, **kwargs):
         api_key  = get_api_key_or_raise()
-        base_url = get_api_base_url()
+        base_url = get_async_api_base_url()
         headers  = {
             "Authorization": f"Bearer {api_key}",
             "Content-Type":  "application/json",