feat: 新增mask区域重绘功能 + 羽化贴回优化 + 发丝增强

新增功能：
- inpaint_mask.py: mask区域重绘服务（enhance/pure_inpaint两种模式）
  严格只在mask区做SD inpainting，发丝自然化
- /inpaint 页面 + /api/inpaint 接口：画板手绘mask + 提示词编辑 + denoising可调
- enhance_hair.webui_img2img: 新增denoising_strength参数（原硬编码0.35）

羽化贴回优化（hair_swap_manual.py 步骤⑥）：
- feather_px（羽化范围）+ feather_alpha（羽化强度）拆分为两个独立参数
- 改为只羽化边缘（mask内部保持硬切，仅边缘带渐变）
- 新增黑底羽化对比图（纯黑背景凸显边缘过渡）

其他改动：
- OSS/COS密钥脱敏：改为可选import，未设环境变量时不崩溃
- manual页面：发型列表改为本次训练的8个（含hair_flow）
- enhance二次增强：重绘区改为「原图头发∪手绘mask」并外扩10%+减发际线带3cm
- 发型清单文档更新：179→180个可用发型（+hair_flow）

涉及文件：
- 新增: inpaint_mask.py, inpaint.html
- 修改: app.py, manual.html, hair_swap_manual.py, enhance_hair.py
- 修改: oss_module.py, upload_oss.py, cos_module.py（密钥脱敏）
- 文档: HAIRSTYLES_AVAILABLE.md, hairstyles_available.csv

docs/hairstyles_available.csv

@@ -1,180 +1,181 @@
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