chore: prettier format all files, brotli, Sentry release tagging, CI gates

Prettier: auto-formatted 103 files to fix baseline. Prettier check in CI
  is now a hard gate (removed continue-on-error).

Brotli: installed libnginx-mod-http-brotli-filter/static. Enabled in nginx
  with brotli_static on for pre-compressed assets and comp_level 6.

Sentry releases: deploy script now exports VITE_APP_VERSION=<git-short-sha>
  before building so each Sentry release maps to an exact commit.
  CI also passes github.sha as VITE_APP_VERSION.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -29,6 +29,7 @@ jobs:
         env:
           NODE_OPTIONS: "--max_old_space_size=4096"
           SENTRY_AUTH_TOKEN: ""
+          VITE_APP_VERSION: ${{ github.sha }}
 
       # ── Quality checks (informational — pre-existing issues exist) ───────
       - name: TypeScript
@@ -41,7 +42,6 @@ jobs:
 
       - name: Prettier
         run: npm run check:prettier
-        continue-on-error: true
 
       # ── Security ─────────────────────────────────────────────────────────
       - name: Audit (high/critical)