docs: 更新需求文档至v0.5并归档开发进度；修复大文件上传与二维码海报

- 需求文档升级到 v0.5：补充二维码海报保存文件名默认格式、大文件上传三层限制（IIS+ASP.NET+前端）部署约束、新增第11章开发进度状态归档（已上线功能/已修复缺陷/已知限制/后续优化）
- 后端 FileController.Upload 增加 [RequestFormLimits(MultipartBodyLengthLimit=220_200_960)]，修复>128MB multipart 上传被拒
- 前端 UploadView 二维码海报：修正 drawImage 缩放错位、顶部logo/标题垂直居中、分区标题间距、大小与有效期分行显示；保存文件名改为 文传易取件码-取件码(原文件名)-流水号.png
- 新增部署脚本：apply_backend.ps1 / force_dll.ps1（app_offline 解锁DLL）/ ftp_fe.ps1 / ftp_diag.ps1 / ftp_apply.ps1 / _diag/check_dll.ps1

(部署手册 IIS部署与FTP发布.md 仅含编码/BOM 差异，未纳入本次提交)

deploy/ftp_apply.ps1

@@ -0,0 +1,55 @@
+# Apply: new appsettings.json (localhost) + restore web.config (stdout off, triggers restart) + nested assets
+$ErrorActionPreference = "Continue"
+$FtpHost="116.198.221.125"; $FtpPort=21; $FtpUser="wenchuanyi"; $FtpPass="r7P^f*v7rFts"
+$Local = "D:\CodeBuddy\Pros\WenChuanyi\backend\WenChuanyi.Api\bin\Release\net8.0\publish"
+$Dist = "D:\CodeBuddy\Pros\WenChuanyi\frontend\dist"
+function NewR($p,$m,$to=90000){ $u="ftp://${FtpHost}:${FtpPort}/"+$p.TrimStart('/'); $r=[System.Net.FtpWebRequest]::Create($u); $r.Method=$m; $r.Credentials=New-Object System.Net.NetworkCredential($FtpUser,$FtpPass); $r.UsePassive=$true; $r.UseBinary=$true; $r.KeepAlive=$false; $r.Timeout=$to; $r }
+function Mk($p){
+  try{ $r=NewR $p ([System.Net.WebRequestMethods+Ftp]::MakeDirectory); $resp=$r.GetResponse(); try{$resp.Close()}catch{} }catch{}
+  Start-Sleep -Milliseconds 300
+}
+function GetSizeF($p){
+  try{ $r=NewR $p ([System.Net.WebRequestMethods+Ftp]::GetFileSize) 30000; $resp=$r.GetResponse(); $s=$resp.ContentLength; $resp.Close(); return $s }
+  catch{ return -1 }
+}
+function UpF($lp,$rp){
+  $want=(Get-Item $lp).Length
+  for($i=1;$i -le 4;$i++){
+    try{
+      $r=NewR $rp ([System.Net.WebRequestMethods+Ftp]::UploadFile) 300000
+      $b=[IO.File]::ReadAllBytes($lp); $r.ContentLength=$b.Length
+      $s=$r.GetRequestStream(); try{ $s.Write($b,0,$b.Length) } finally { $s.Close() }
+      $resp=$r.GetResponse(); try{ $resp.Close() }catch{}
+      Start-Sleep -Milliseconds 300
+      $after=GetSizeF $rp
+      if($after -eq $want){ Write-Host "UP OK $rp"; return $true }
+      Write-Host "SIZE MISMATCH $rp got=$after want=$want"
+    }catch{ Write-Host "RETRY($i) $rp : $($_.Exception.Message)" }
+    Start-Sleep -Seconds 3
+  }
+  Write-Host "FAIL $rp"; return $false
+}
+# 1. appsettings.json (localhost db)
+UpF "$Local\appsettings.json" "/wwwroot/appsettings.json"
+# 2. web.config: stdout off (production) - also triggers app pool restart
+$wc = @"
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <location path="." inheritInChildApplications="false">
+    <system.webServer>
+      <handlers>
+        <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
+      </handlers>
+      <aspNetCore processPath="dotnet" arguments=".\WenChuanyi.Api.dll" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" hostingModel="inprocess" />
+    </system.webServer>
+  </location>
+</configuration>
+"@
+$tmp = Join-Path $env:TEMP "wcy_web_prod.config"
+[IO.File]::WriteAllText($tmp, $wc, [Text.Encoding]::UTF8)
+UpF $tmp "/wwwroot/web.config"
+# 3. nested wwwroot assets (frontend static files served by ASP.NET Core WebRoot)
+Mk "/wwwroot/wwwroot/assets"
+UpF "$Dist\assets\index-Bwz67ZeI.js" "/wwwroot/wwwroot/assets/index-Bwz67ZeI.js"
+UpF "$Dist\assets\index-c9wa7v4K.css" "/wwwroot/wwwroot/assets/index-c9wa7v4K.css"
+Write-Host "APPLY DONE"