[Bug]: Server failed health check after timeout

### Platform

macOS

### Operating system version

26.2（25C56）

### System architecture

ARM64 (M1, M2, etc)

### PolyScope Version

0.17.0

### Bug description

[electron] Starting prod server: /Applications/Polyscope.app/Contents/Resources/polyscope-server
[electron] Waiting for server health check on port 4321...
[server:err] 424 | `)}function dqT(T){if(T.points.length<2)return"";let R=T.points.map((A)=>`${A.x},${A.y}`).join(" "),_=!T.identifying?' stroke-dasharray="6 4"':"";return``}function nqT(T){if(!T.label||T.points.length<2)return"";let R=oqT(T.points),A=x_(T.label,DR.edgeLabel,uR.edgeLabel)+8,D=DR.edgeLabel+6;return`
[server:err] 425 | ${zL(T.label)}`}function iqT(T){if(T.points.length<2)return"";let R=[],_=T.points[0],A=T.points[1];R.push(EQ(_,A,T.cardinality1));let D=T.points[T.points.length-1],O=T.points[T.points.length-2];return R.push(EQ(D,O,T.cardinality2)),R.join(`
[server:err] 426 | `)}function EQ(T,R,_){let A=[],D=L9.connector+0.25,O=T.x-R.x,q=T.y-R.y,H=Math.sqrt(O*O+q*q);if(H===0)return"";let B=O/H,W=q/H,L=-W,J=B,U=T.x-B*4,F=T.y-W*4,z=T.x-B*16,K=T.y-W*16,N=_==="one"||_==="zero-one",E=_==="many"||_==="zero-many",G=_==="zero-one"||_==="zero-many";if(N){A.push(``);let V=U-B*4,C=F-W*4;A.push(``)}if(E){let V=U,C=F;A.push(``),A.push(``),A.push(``)}if(G){let j=E?20:12,V=T.x-B*j,C=T.y-W*j;A.push(``)}return A.joi
[server:err] 427 | `)}function oqT(T){if(T.length===0)return{x:0,y:0};if(T.length===1)return T[0];let R=0;for(let D=1;D=_){let B=H>0?(_-A)/H:0;return{x:T[D-1].x+O*B,y:T[D-1].y+q*B}}A+=H}return T[T.length-1]}function zL(T){return T.replace(/&/g,"&").replace(//g,">").replace(/"/g,""").replace(/'/g,"'")}function rqT(T){let R=T.trim().split(`
[server:err] 428 | `)[0]?.trim().toLowerCase()??"";if(/^sequencediagram\s*$/.test(R))return"sequence";if(/^classdiagram\s*$/.test(R))return"class";if(/^erdiagram\s*$/.test(R))return"er";return"flowchart"}function tqT(T){return{bg:T.bg??_Q.bg,fg:T.fg??_Q.fg,line:T.line,accent:T.accent,muted:T.muted,surface:T.surface,border:T.border}}async function ZQ(T,R={}){let _=tqT(R),A=R.font??"Inter",D=R.transparent??!1,O=rqT(T),q=T.split(`
[server:err] 429 | `);return T9(R,A,O,_,{skipUserBroadcast:"Committing changes"}).catch((q)=>console.error("[api] agent.prompt (commit) failed:",q)),G_({workspace_id:A,agent:{status:"working"}})},"workspaces.create_pr":async(T,R,_)=>{let{workspace_id:A,title:D,body:O}=T,q=T.draft===!0;if(!A)return OR("validation_error","workspace_id is required",422);if(!FT(A))return OR("not_found","Workspace not found",404);let B=q?tW(A,D,O):rW(A,D,O);return T9(R,A,B,_,{skipUserBroadcast:q?"Creating draft pull request":"Creating pull request"}).catch((L)=>console.error("[api] agent.prompt (pr) failed:",L)),G_({workspace_id:A,agent:{status:"working"}})},"workspaces.stop":async(T)=>{let R=T.workspace_id;if(!R)return OR("validation_error","workspace_id is required",422);if(!FT(R))return OR("not_found","Workspace not found",404);return await N7(R),G_({workspace_id:R,agent:{status:"idle"}})},"api.key_exchange":async(T)=>{let R=f_(T.public_key),_=f_(T.nonce);if(!R)return OR("validation_error","public_key is required",422);if(!_)return OR("validation
[server:err] error: Failed to start server. Is port 4321 in use?
[server:err] syscall: "listen",
[server:err] errno: 0,
[server:err] code: "EADDRINUSE"
[server:err] at (/$bunfs/root/polyscope-server-aarch64-apple-darwin:429:3906)
[server:err] Bun v1.3.11 (macOS arm64)
[electron] Server exited with code 1
[electron] Server failed health check after timeout

### Steps to reproduce

_No response_

### Relevant log output

```shell

```

从启动 polyscope-server 并等待端口 4321 的 Electron 启动路径开始；在该端口已被占用的 macOS ARM64 上重现问题，并检查 EADDRINUSE 退出。确定此冲突的预期行为，并验证服务器不再导致无法解释的 health-check 失败；如果项目有相关的测试路径，则添加 coverage。

由索引模型根据 Issue 内容生成。