钢琴Boss：大激光加半圆+大炮塔改红+停掉pedal小子弹

- 大激光矩形上边加向上凸起的半圆（arc Math.PI→0），直径=激光宽度，像枪口扩口
- 左右大炮塔外观全改红色（装甲#5a1a1a/#8a2a2a，指示灯#ff3355）
- 从钢琴minors去掉pedal，大炮塔不再发射小攻击子弹，只保留大激光惩罚+topRain

star-raid/js/boss_art.js

@@ -42,9 +42,9 @@ function drawPiano(b,t,fl,split){
   // —— 左右大炮塔（踏板重音炮位；左紫右蓝；P2随最外环带滑开16） ——
   {const off0=split*16;
    for(const sd of[-1,1]){const px2=sd*(112+off0);
-     circ(px2,2,5.5,"#33436a");circ(px2-1.5,0,2.5,"#55648a");
+     circ(px2,2,5.5,"#5a1a1a");circ(px2-1.5,0,2.5,"#8a2a2a");
      px(px2-1.5,4,3,8,"#1b2434");
-     px(px2-1,10,2,3,b.pedT>0?"#ffffff":(sd<0?"#b98cff":"#43e8ff"));
+     px(px2-1,10,2,3,"#ff3355");
      // 大激光蓄力前摇：画在炮塔口下方的蓄力圆（与小激光琴键蓄力圆同源，换色赤红）
      const prog=sd<0?((b.pedLasL||0)/60):((b.pedLasR||0)/60);
      if(prog>0){const a=Math.min(prog,1);

star-raid/js/enemies.js

@@ -194,7 +194,7 @@ const BOSSES=[
  {name:"太空原种",sub:"SPACE SPAWN",hp:1350,col:"#ff8fc8",r:20,rr:[20,34],ryy:[26,18],wide:1,main:"spawn",minors:["wiggle","spikeSnipe","sporeArc","tentBeam","mawSnipe","wingRain"],phases:2,tier:1},
  {name:"歼灭者",sub:"ANNIHILATOR",hp:1700,col:"#b05ce8",r:22,main:"annihilate",minors:["aimSpread","spawnMine"],phases:3,tier:0},
  {name:"暗黑突击",sub:"DARK ASSAULT",hp:2100,col:"#ff3355",r:9,rr:[9,10,11],ryy:[5,6,7],main:"assault",minors:["rain","aimSpread"],phases:3,tier:2},
- {name:"激光钢琴",sub:"LASER PIANO",hp:5000,col:"#43e8ff",r:26,rr:[100,100],ryy:[30,30],main:"piano",minors:["topRain","pedal"],phases:2,static:1,tier:1},
+ {name:"激光钢琴",sub:"LASER PIANO",hp:5000,col:"#43e8ff",r:26,rr:[100,100],ryy:[30,30],main:"piano",minors:["topRain"],phases:2,static:1,tier:1},
  {name:"母巢核心",sub:"HIVE CORE",hp:2800,col:"#ff9a3d",r:22,main:"hive",minors:["spawnMini","aimSpread","ring"],phases:3,tier:0},
  {name:"夺权者X",sub:"USURPER X",hp:3700,col:"#e8f4ff",r:24,rr:[58,26],ryy:[34,40],wide:1,main:"usurper",minors:["deckVolley","pillar","aimSpread"],phases:2,tier:2},
  {name:"暗黑魔碟",sub:"DARK SAUCER",hp:4500,col:"#8a5cff",r:24,rr:[30,32,34],main:"saucer",minors:["coneFan","crossEye","dartSpiral"],phases:3,tier:3},   // 间歇期无圆圈弹幕（去ringBig，P3主攻击仍两层）

star-raid/js/render.js

@@ -224,12 +224,12 @@ function drawBossFx(){
       ctx.beginPath();ctx.moveTo(bm.x1,bm.y1);ctx.lineTo(bm.x2,bm.y2);ctx.stroke();ctx.globalAlpha=1;}}
     else{ctx.globalCompositeOperation="lighter";
       ctx.globalAlpha=clamp(bm.life/10,0,1)*0.85;
-      // 大激光起点扩口半圆（发射时较小然后扩大）
+      // 大激光起点扩口半圆（直径=激光宽度，半圆顶部向上凸起覆盖矩形上边）
-      if(bm.dmg>=90000){const pR=Math.min(bm.w*0.7,bm.w*0.6*(1-bm.life/(bm.dur0||1)));
+      if(bm.dmg>=90000){const pR=Math.min(bm.w*0.5,bm.w*0.5*(1-bm.life/(bm.dur0||1))+1);
-        if(pR>0.5){ctx.fillStyle=bm.col;
+        if(pR>1){ctx.fillStyle=bm.col;
-          ctx.beginPath();ctx.arc(bm.x1,bm.y1,pR,0,Math.PI);ctx.fill();
+          ctx.beginPath();ctx.arc(bm.x1,bm.y1,pR,Math.PI,0);ctx.fill();
           ctx.strokeStyle="#fff";ctx.lineWidth=Math.max(1,pR/3);
-          ctx.beginPath();ctx.arc(bm.x1,bm.y1,pR,0,Math.PI);ctx.stroke();}}
+          ctx.beginPath();ctx.arc(bm.x1,bm.y1,pR,Math.PI,0);ctx.stroke();}}
       ctx.strokeStyle=bm.col;ctx.lineWidth=bm.w;
       ctx.beginPath();ctx.moveTo(bm.x1,bm.y1);ctx.lineTo(bm.x2,bm.y2);ctx.stroke();
       ctx.strokeStyle="#fff";ctx.lineWidth=Math.max(1,bm.w/3);