feat(modules): ctx additions and the post-hook registry (API 1.1.0)

Everything the extraction needed from core that ctx did not already offer.
Additions only, so minor.

ctx.activity.log, because an admin action a module performs has to land in
core's one audit log or the trail has a hole exactly where a module operates the
game -- a module keeping its own log would be a second place to look, which in
practice means a place nobody looks. Write-only; reading the log is the admin
panel's job and it spans every actor.

ctx.users.getById, one function for one caller: the admin.users.detail slot
router needs the user its prefix names. ctx.site.baseUrl, because a module has
to build absolute links and §2.7 forbids it reading core's APP_BASE_URL -- a
getter, not a captured string, so it cannot go stale against the env.

ctx.middleware.rateLimit is core's makeLimiter, plus accountChangeLimiter handed
over whole. The split is deliberate: a module states its own window and cap
because it knows what its endpoints cost, and takes the plumbing from core so
there is one express-rate-limit in the process and one place a breach is logged.
accountChangeLimiter is shared policy -- core's /auth/me and /player/account sit
behind the same counter -- so a module's account-change route has to land IN it
rather than beside it. marketLimiter was UO policy living in core's file and
leaves with the route it guards.

registerPostHook is the fourth registry, and the last thing binding core to the
module. Core's post controller called newsGump.syncPost directly: core's CMS
naming a UO file. It now publishes what it already knows and a subscriber
decides what to do with it. Not folded into registerAnnounceLeg, which fires on
the same transition, because a leg is a one-shot DELIVERY with retry and
classification while a post hook maintains idempotent STATE, runs on delete as
well as save, and refreshes silently on an edit.

Also fixes a real loader defect the extraction exposed: schema table names were
matched against the RAW file, so a fragment whose header says "every CREATE
TABLE carries IF NOT EXISTS" was rejected for a prefix violation on a table
called `carries`. module-uo's fragment hit exactly that. Both scans now read
split statements, which strip comments -- the same class of bug as a boundary
check failing on its own documentation.

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

server/src/middleware/rateLimit.js

@@ -118,19 +118,6 @@ const passwordResetConfirmLimiter = makeLimiter({
   message: 'Too many attempts. Please try again later.',
 })
 
-// The player-vendor market search. The first genuinely expensive PUBLIC endpoint
-// on the site: every call is a LIKE scan plus a COUNT over the listings table,
-// which on a large shard is the biggest table there is, and it is anonymous by
-// default. Generous for a human browsing shops (a typed search is debounced to
-// one request, and paging is a click), tight enough that it cannot be used as a
-// cheap way to load the database.
-const marketLimiter = makeLimiter({
-  windowMs: 60 * 1000,
-  max: 60,
-  label: 'market',
-  message: 'Too many searches. Please slow down.',
-})
-
 // CSP violation reports. Unauthenticated by necessity (browsers send them with no
 // session), and every accepted report writes a log line — so an attacker who can get
 // a victim to load a page could otherwise use it as a log-flood amplifier. Generous
@@ -144,6 +131,14 @@ const cspReportLimiter = makeLimiter({
 })
 
 module.exports = {
+  // Exported for modules (MODULE_API.md 2.3, added in API 1.1.0). A module
+  // writes its own policy -- the window and the cap are its business, since it
+  // knows what its endpoints cost -- but it takes the PLUMBING from here: one
+  // express-rate-limit in the process, one store, and one place limit breaches
+  // are logged. A module resolving the package itself would get a second store,
+  // and a limit enforced by two independent counters is not the limit either of
+  // them states.
+  makeLimiter,
   loginLimiter,
   registerLimiter,
   accountChangeLimiter,
@@ -154,6 +149,5 @@ module.exports = {
   mobileSsoExchangeLimiter,
   passwordResetRequestLimiter,
   passwordResetConfirmLimiter,
-  marketLimiter,
   cspReportLimiter,
 }