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.md

@@ -1,6 +1,6 @@
 # 可用发型清单
 
-> 当前共 **179 个发型**可用于换发型功能（hair_flow 训练完成后为 180 个）。
+> 当前共 **180 个发型**可用于换发型功能。
 > 数据来源：`/api/hairstyles` 接口实时返回，要求发型同时具备「LoRA权重 + ref材质 + config.json」三件齐全。
 > 全量清单见同目录 `hairstyles_available.csv`。
 
@@ -10,11 +10,11 @@
 
 | 类别 | 数量 | 说明 |
 |------|------|------|
-| **总可用发型** | **179** | 三件齐全，可直接换发型 |
+| **总可用发型** | **180** | 三件齐全，可直接换发型 |
 | ├ 男款 (boy) | 93 | 适合男性脸型 |
-| ├ 女款 (girl) | 86 | 适合女性脸型 |
-| ├ 中文名命名 | 7 | 本次按脸型训练的新发型 |
-| ├ 英文名命名 | 15 | 历史测试发型 |
+| ├ 女款 (girl) | 87 | 适合女性脸型（+hair_flow） |
+| ├ 中文名命名 | 7 | 按脸型训练的新发型 |
+| ├ 英文名命名 | 16 | 历史测试发型 + hair_flow |
 | └ 数字ID命名 | 157 | 生产环境发型（雪花算法ID） |
 
 **性别说明**：gender 字段决定发型被分到"男款/女款"，但换发型时**男女发型都能用**（只是预览图用对应性别的标准脸）。
@@ -55,6 +55,7 @@
 
 | hair_id | gender | 备注 |
 |---------|--------|------|
+| **hair_flow** | **girl** | **波浪卷发，最新训练（2026-07-07）** |
 | huaban1 | girl | 画板1 |
 | huaban2 | girl | 画板2 |
 | new_test_001 | boy | 测试 |
@@ -104,8 +105,9 @@
 
 ### 2. 调试页（带可视化）
 - `http://localhost:8888/debug` — 全参数调试台
-- `http://localhost:8888/manual` — 手绘 mask 重绘
-- `http://localhost:8888/hairline` — 发际线 mask 实验
+- `http://localhost:8888/manual` — 手绘 mask 换发型（含 enhance 二次增强 + 羽化贴回）
+- `http://localhost:8888/inpaint` — **mask区域重绘**（发丝自然化，enhance/pure_inpaint两种模式）
+- `http://localhost:8888/hairline` — 发际线 mask 实验（4种方案对比）
 
 ### 3. API 调用
 ```bash

docs/hairstyles_available.csv

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