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

hair_grow_service/static/manual.html

@@ -159,9 +159,13 @@ body { font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif; ba
       </div>
     </div>
     <div class="field">
-      <div class="field-label">feather_px <span class="val" id="v-fp">0</span><span class="tip" title="严格mask贴回的边缘羽化像素。0=硬边缘，>0=高斯模糊边缘平滑过渡（消除贴回接缝）">ⓘ</span></div>
+      <div class="field-label">feather_px <span class="val" id="v-fp">0</span><span class="tip" title="羽化范围(像素)，边缘带宽度。0=无羽化，越大羽化范围越宽">ⓘ</span></div>
       <input type="range" id="fp" min="0" max="60" step="1" value="0" oninput="syncInt('fp')">
     </div>
+    <div class="field">
+      <div class="field-label">feather_alpha <span class="val" id="v-fa">1.00</span><span class="tip" title="羽化强度(0~1)。0=硬切不羽化，1=最大羽化。控制边缘过渡柔和程度">ⓘ</span></div>
+      <input type="range" id="fa" min="0" max="1.0" step="0.05" value="1.0" oninput="syncFloat('fa')">
+    </div>
     <div class="readonly-info">
       <b style="color:#888">webui端固定：</b><br>
       <code>cfg=7</code> <code>steps=20</code> <code>sampler=DPM++ 2M Karras</code>
@@ -182,7 +186,7 @@ body { font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif; ba
 
   <!-- 中间发型选择 -->
   <div class="mid-panel">
-    <h3>③ 选发型</h3>
+    <h3>③ 选发型 <span id="count-info" style="font-size:10px;color:#888;font-weight:normal"></span></h3>
     <div class="hairstyle-grid" id="hairstyle-grid"><div style="color:#666;font-size:11px">加载中...</div></div>
     <div style="font-size:11px;color:#4ecca3;margin-top:8px;text-align:center" id="sel-info">未选择</div>
     <button class="btn-tool" style="margin-top:8px;width:100%" onclick="loadStatus()">↻ 刷新</button>
@@ -225,14 +229,6 @@ body { font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif; ba
 <script>
 (function(){
   const $=id=>document.getElementById(id);
-  const HAIRSTYLES = [
-    {face:"圆",name:"圆-心形"},{face:"圆",name:"圆-椭圆"},{face:"圆",name:"圆-波浪"},{face:"圆",name:"圆-直线"},{face:"圆",name:"圆-花瓣"},
-    {face:"心形",name:"心形-心形"},{face:"心形",name:"心形-椭圆"},{face:"心形",name:"心形-波浪"},{face:"心形",name:"心形-直线"},{face:"心形",name:"心形-花瓣"},
-    {face:"方脸",name:"方脸-心形"},{face:"方脸",name:"方脸-椭圆"},{face:"方脸",name:"方脸-波浪"},{face:"方脸",name:"方脸-直线"},{face:"方脸",name:"方脸-花瓣"},
-    {face:"椭圆",name:"椭圆-心形"},{face:"椭圆",name:"椭圆-椭圆"},{face:"椭圆",name:"椭圆-波浪"},{face:"椭圆",name:"椭圆-直线"},{face:"椭圆",name:"椭圆-花瓣"},
-    {face:"菱形",name:"菱形-心"},{face:"菱形",name:"菱形-椭圆"},{face:"菱形",name:"菱形-波浪"},{face:"菱形",name:"菱形-直线"},{face:"菱形",name:"菱形-花瓣"},
-    {face:"长",name:"长-心形"},{face:"长",name:"长 -椭圆"},{face:"长",name:"长 -波浪"},{face:"长",name:"长 -直线"},{face:"长",name:"长 -花瓣"}
-  ];
 
   let readySet=new Set(), selectedHair=null, imgB64Orig=null;
   // 画板状态
@@ -240,6 +236,11 @@ body { font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif; ba
   const imgCtx=imgCanvas.getContext("2d"),maskCtx=maskCanvas.getContext("2d",{willReadFrequently:true});
   let mode="brush",brushSize=25,drawing=false,lastX=0,lastY=0;
 
+  // 本次训练的发型（昨天6个 + 今天hair_flow）
+  const HAIRSTYLES = [
+    {name:"hair_flow"},{name:"圆-心形"},{name:"圆-椭圆"},{name:"圆-波浪"},
+    {name:"圆-直线"},{name:"圆-花瓣"},{name:"心形-心形"},{name:"心形-椭圆"}
+  ];
   async function loadStatus(){
     try{
       const r=await fetch("/api/hairstyles");const d=await r.json();
@@ -254,7 +255,7 @@ body { font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif; ba
       const ready=readySet.has(h.name);
       const it=document.createElement("div");
       it.className="hairstyle-item"+(ready?" ready":" pending")+(h.name===selectedHair?" selected":"");
-      it.innerHTML=`<img loading="lazy" src="/train_src/${encodeURIComponent(h.name)}" onerror="this.style.objectFit='contain';this.src='data:image/svg+xml;utf8,<svg xmlns=%22http://www.w3.org/2000/svg%22 width=%22100%22 height=%22100%22><text x=%2250%22 y=%2255%22 text-anchor=%22middle%22 fill=%22%23666%22 font-size=%2210%22>训练中</text></svg>'"><div class="name">${h.name}</div>`;
+      it.innerHTML=`<img loading="lazy" src="/train_src/${encodeURIComponent(h.name)}" onerror="this.style.objectFit='contain';this.src='data:image/svg+xml;utf8,<svg xmlns=%22http://www.w3.org/2000/svg%22 width=%22100%22 height=%22100%22><text x=%2250%22 y=%2255%22 text-anchor=%22middle%22 fill=%22%23666%22 font-size=%2210%22>无图</text></svg>'"><div class="name">${h.name}</div>`;
       if(ready) it.onclick=()=>{
         selectedHair=h.name;
         $("sel-info").textContent="已选: "+h.name;
@@ -366,6 +367,7 @@ body { font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif; ba
       is_hr:$("sw-is_hr").classList.contains("on"),
       dilate_kernel:[parseInt($("dk0").value),parseInt($("dk1").value)],
       feather_px:parseInt($("fp").value),
+      feather_alpha:parseFloat($("fa").value),
       denoising_strength:parseFloat($("den").value),
       enhance:$("sw-enhance").classList.contains("on"),
       enhance_denoising:parseFloat($("ed").value),