fix(cinny-web): no-cache for the app shell on SPA routes; keep old hashed assets 14 days (#23)

SPA URLs (/, /home/…, /login/…) are rewritten to /index.html inside
location /, which set no cache headers, so browsers heuristically reused
a stale shell after a deploy, and rsync --delete had just removed the
assets it referenced: a blank app until the shell expired. Send
no-cache for the rewritten shell (map on $uri; location / now includes
the security headers, since add_header drops the inherited ones), and
stop deleting previous builds' hashed assets: prune after 14 days.

Fixes #23

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

README.md

@@ -84,6 +84,7 @@ matrix/
 - Service: `draupnir.service`
 - Management room: `#management:matrix.lotusguild.org` (`!mEvR5fe3jMmzwd-FwNygD72OY_yu8H3UP_N-57oK7MI`)
 - Bot account: `@draupnir:matrix.lotusguild.org` (power level 100 in all protected rooms and the Lotus Guild space)
+- Encryption: off (`experimentalRustCrypto: false`), so Draupnir cannot read commands sent in the encrypted management room; send them unencrypted for now. Turning it on needs a device-bound access token first: with the current token, 2.9.0 exits with "Encryption not possible: server not revealing device ID" (tried and reverted 2026-10-16, #26 / #28).
 - Subscribed ban lists: `#community-moderation-effort-bl:neko.dev`, `#matrix-org-coc-bl:matrix.org`
 - Rebuild: `NODE_OPTIONS="--max_old_space_size=6144" npm run build`
 - Healthz endpoint: `http://10.10.10.24:8081/healthz` (200 = healthy, 418 = disconnected)
@@ -798,7 +799,7 @@ Leaving a space does **not** leave its child rooms; they are independent rooms w
 - [ ] `synchronous_commit = off` — **deliberately NOT applied.** Would be a real write-latency win, but this cluster hard-resets every few hours (HA self-fences on corosync quorum loss + the large1 DIMM), so it would drop up to ~600ms of committed messages *per reset* rather than once in a blue moon. Revisit once the cluster is stable.
 
 ### Auth & SSO
-- [x] Token-based registration
+- [x] Open registration disabled (`enable_registration: false`, 2026-10-16): accounts come from LLDAP and are created on first sign-in through Lotus SSO (Authelia OIDC, which keeps its own registration on). The old registration token was deleted.
 - [x] SSO/OIDC via Authelia
 - [x] `allow_existing_users: true` for linking accounts to SSO
 - [x] Password auth alongside SSO

cinny/lotus_deploy.sh

@@ -160,7 +160,13 @@ echo "[$(date '+%Y-%m-%d %H:%M:%S')] Deploying to $WEBROOT..."
 # /var/www/html/config.json by lxc106-cinny.sh. The build ships a DEV default
 # (allowCustomHomeservers:true); rsyncing it would clobber the production config
 # on every deploy. Keep the app bundle and the runtime config separate.
-rsync -a --delete --exclude config.json dist/ "$WEBROOT/"
+# [matrix #23] Keep the previous builds' hashed assets for a while: a browser
+# still holding an older index.html (or service-worker precache) asks for its
+# assets/index-<old hash>.js, and deleting them on every deploy broke the app
+# for those users until their cached shell expired. Prune after 14 days.
+rsync -a --delete --exclude config.json --exclude assets/ dist/ "$WEBROOT/"
+rsync -a dist/assets/ "$WEBROOT/assets/"
+find "$WEBROOT/assets" -type f -mtime +14 -delete
 
 echo "[$(date '+%Y-%m-%d %H:%M:%S')] ===== Deploy complete ($VITE_APP_VERSION) ====="
 

cinny/nginx.conf

@@ -1,3 +1,12 @@
+# [matrix #23] SPA routes (/, /home/…, /login/…) are rewritten to /index.html
+# inside `location /`, where no cache headers were set: browsers then reused a
+# heuristically fresh shell after a deploy and requested deleted assets. Only
+# the rewritten shell gets no-cache; other files there keep their defaults.
+map $uri $lotus_shell_cache_control {
+    /index.html "no-cache, no-store, must-revalidate";
+    default     "";
+}
+
 server {
     listen 80;
     listen [::]:80;
@@ -99,6 +108,9 @@ server {
     }
 
     location / {
+        # add_header here drops the server-level headers, so include them again.
+        include snippets/cinny-security-headers.conf;
+        add_header Cache-Control $lotus_shell_cache_control always;
         rewrite ^/config\.json$          /config.json break;
         rewrite ^/manifest\.json$        /manifest.json break;
         rewrite ^/sw\.js$                /sw.js break;