fix: stop shipping source comments in the server bundle

`tsc` keeps comments by default, so the doc comment in archive-grouping.ts
describing the sidecar layout was emitted into dist-server and copied into the
runtime image. Every published container image on ghcr carries it — verified by
pulling the dist-server layer of :latest and grepping it:

    app/src/lib/archive-grouping.js:10:  *   <user>  -> posts (base)

That comment names real archived accounts, which is exactly what main was
redacted to remove, so the redaction was incomplete while the build kept
re-emitting them. The frontend was never affected: Vite strips comments, and
the 432K dist layer greps clean.

--removeComments takes dist-server from 0 comment lines. docs/ was never at
risk; the multi-stage build copies only dist/ and dist-server/ into runtime.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UXfdJu7QhSJLr47K7koTDF

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "dev": "vite --port=3000 --host=0.0.0.0",
     "build": "vite build && npm run build:server",
-    "build:server": "tsc server.ts --esModuleInterop --module ESNext --target ES2022 --moduleResolution bundler --outDir dist-server",
+    "build:server": "tsc server.ts --esModuleInterop --module ESNext --target ES2022 --moduleResolution bundler --removeComments --outDir dist-server",
     "preview": "vite preview",
     "server": "tsx server.ts",
     "clean": "rm -rf dist",