chore: remove internal docs from repo, update public documentation

Remove docs/superpowers/, .claude/ config, and PRD.md from version
control (kept locally via .gitignore). Update README, CHANGELOG,
VitePress docs, and .env.example to reflect recent features: Files
page, teams, admin settings, persistent storage, and various API
improvements.

apps/api/src/routes/tools/upscale.ts

@@ -62,10 +62,11 @@ export function registerUpscale(app: FastifyInstance) {
       await writeFile(inputPath, fileBuffer);
 
       // Process
-      const onProgress = clientJobId
+      const jobIdForProgress = clientJobId;
+      const onProgress = jobIdForProgress
         ? (percent: number, stage: string) => {
             updateSingleFileProgress({
-              jobId: clientJobId!,
+              jobId: jobIdForProgress,
               phase: "processing",
               stage,
               percent,