feat(shared-ols): shared OpenLiteSpeed tier image (webserver-only, fronts cac-lsphp sidecars)

One OLS container fronting many tenants' detached cac-lsphp sidecars — the
OLS analogue of shared-httpd. Runs NO PHP locally; every site's PHP goes to
its own sidecar over LSAPI (extProcessor type lsapi, address <sidecar>:9000).

Key design fact (established by PoC): OLS has NO top-level 'include' directive,
so render-shared-ols-config.sh assembles httpd_config.conf from the panel's
per-site files (vhconf.conf + site.meta) at boot and on every change — the
'include' OLS lacks. Per-site detail uses the OLS-native configFile +
vhost-scoped extprocessor model. LSCache is module-level (a configFile-loaded
vhost rejects a bare cache{} block); the WP LiteSpeed plugin controls
cacheability via X-LiteSpeed-Cache-Control headers.

- Dockerfile.shared-ols: litespeed base + inotify-tools/envsubst/openssl,
  admin bound to loopback, :80/:443 self-signed, healthz HEALTHCHECK.
- entrypoint-shared-ols.sh: cert + health vhost + render + watcher, then
  daemon-mode OLS supervision (reused from cac-litespeed so self-restarts
  don't kill PID 1).
- render-shared-ols-config.sh: strip stock (incl local lsphp) + append base +
  per-site stanzas + listeners with all maps + catch-all health vhost.
- ols-htaccess-watcher.sh: inotify debounce+floor -> lswsctrl restart (spec 5.3).
- configs/shared-ols/{httpd_config_base,vhconf}.tpl.
- CI: Build-Shared-OLS job.

Verified locally end-to-end: zero-site boot healthy on :443; add site via the
panel contract -> Host-routed to the right sidecar (SAPI=litespeed); real
client IP + HTTPS behind X-Forwarded headers; LSCache miss->hit; .htaccess
change triggers graceful restart; unknown Host hits health catch-all (200).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

configs/shared-ols/vhconf.tpl

@@ -0,0 +1,70 @@
+## Per-site OLS vhost detail — rendered by the WHP panel (shared_ols_manager)
+## to $SITES_ROOT/<vhname>/vhconf.conf and referenced from the vhost stanza's
+## `configFile` in httpd_config.conf. ~~PLACEHOLDERS~~ are filled by the panel
+## (matches the shared-vhost-template.tpl convention). One directive per line —
+## OLS PlainConf does NOT accept ';' separators.
+##
+## CRITICAL (feedback_ols_lsapi_no_script_filename_remap): docRoot here MUST be
+## the SAME absolute path the cac-lsphp sidecar has mounted, because OLS hands
+## lsphp exactly docRoot+URI as SCRIPT_FILENAME and lsphp opens it. Both are
+## /mnt/users/<user>/<domain>/public_html. The panel asserts this parity.
+
+docRoot                   ~~DOCROOT~~
+enableScript              1
+
+## Remote detached lsphp over LSAPI/TCP. address = the site's sidecar container
+## on the docker network. autoStart 0 = OLS NEVER spawns it (it's a separate
+## container). maxConns MUST equal the sidecar's PHP_LSAPI_CHILDREN — the panel
+## writes both from the single fpm_max_children value so they can't drift.
+## NO `env` lines: detached lsphp owns its env in the sidecar (spec 5.2).
+## NOTE on `path`: required syntactically but UNUSED for a remote autoStart-0
+## processor (OLS never spawns it). Point it at a path that always exists in the
+## shared-ols image (the stock fcgi-bin/lsphp), NOT a version-specific
+## /usr/local/lsws/lsphpNN — the shared-ols image carries only one lsphp build,
+## while sites may run any PHP version on their sidecar. The sidecar owns the
+## real PHP runtime/version.
+extprocessor ~~VHNAME~~_lsphp {
+  type                    lsapi
+  address                 ~~SIDECAR~~:9000
+  maxConns                ~~MAXCONNS~~
+  autoStart               0
+  path                    /usr/local/lsws/fcgi-bin/lsphp
+  initTimeout             60
+  retryTimeout            0
+  respBuffer              0
+  persistConn             1
+}
+
+scripthandler {
+  add                     lsapi:~~VHNAME~~_lsphp php
+}
+
+## context / drives static serving + .htaccess. RewriteFile .htaccess is OLS's
+## autoLoadHtaccess equivalent — re-read on graceful restart (the watcher
+## triggers that within the documented window).
+context / {
+  allowBrowse             1
+  location                $DOC_ROOT/
+  rewrite {
+    enable                1
+    RewriteFile           .htaccess
+  }
+  addDefaultCharset       off
+}
+
+## LSCache is enabled at MODULE scope (httpd_config_base.tpl) and honored per
+## response via the LiteSpeed Cache WP plugin's X-LiteSpeed-Cache-Control
+## headers — a `configFile`-loaded vhost in OLS 1.8.4 does NOT accept a bare
+## `cache {}` block (verified 2026-06-10), so there is intentionally no per-vhost
+## cache block here. OLS stores each vhost's cache in its own subdir under the
+## module storagePath automatically (per-vhost isolation, spec 5.2).
+
+errorlog ~~LOG_DIR~~/error_log {
+  logLevel                WARN
+  rollingSize             50M
+  keepDays                7
+}
+accesslog ~~LOG_DIR~~/access_log {
+  rollingSize             50M
+  keepDays                7
+}