feat(server): port the UO models, utils and schema fragment

The data half of the extraction: 8 model directories, 13 utils, the shard
stream catalog and the 27-table schema fragment with its purge.

server/core.js is what makes the port a one-line import change per file rather
than a signature change per function. Ported code requires its dependencies at
file scope -- `const { query } = require('../../core')` -- which runs before
register() has been called and before any ctx exists. So every member is a
stable function that resolves ctx when CALLED, and nothing may be destructured
off ctx at init either, because core is free to hand over a getter.

Two helpers are vendored rather than taken from ctx, and the line between them
is the point. utils/excerpt.js is core's deriveExcerpt -- nine lines of pure
text handling. Core's sanitiser next to it was NOT copied: a second copy of a
security control diverges silently the moment either is fixed. announceLinks.js
vendors legError and articleUrl the same way, but baseUrl could not be: core's
reads APP_BASE_URL, and §2.7 forbids a module reading core's environment, so it
comes off ctx.site.baseUrl.

The schema fragment is core's 27 shard_*/uo_link_* statements, verbs CREATE,
ALTER and UPDATE only, every CREATE TABLE guarded. Two of its tables carry a
foreign key INTO users, which is allowed and is why the replay order matters --
core's schema is in place before this runs. The reverse never occurs and must
not: it would make core unable to boot without a module installed.

One real port bug caught by the integration run, not by tests: the atlas art
map resolved `../../../db/data`, which pointed at core's tree when this file
lived there and points outside server/ now. A path that happens to resolve is
exactly what survives a green suite, because the absent-file branch returns {}
and looks like the normal case.

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

server/model/shardClilocs/shardClilocs.db.js

@@ -0,0 +1,110 @@
+const core = require('../../core')
+
+const { query } = core
+
+// Raw SQL for the cliloc table. `shard_clilocs` is IMPORT-OWNED: `replaceAll`
+// empties and refills it inside one transaction, and nothing else in the
+// codebase writes to it. No foreign keys, consistent with every other shard_*
+// table.
+
+const BATCH = 1000
+
+/**
+ * Replace the entire cliloc table in one transaction.
+ *
+ * All-or-nothing on purpose: a failed reload must leave the previous table
+ * intact rather than a half-loaded one, because a partially-imported cliloc
+ * table is indistinguishable from a complete one to anyone reading it — you
+ * would just see some items named and some not, which is also what "no table at
+ * all" looks like.
+ *
+ * `DELETE`, not `TRUNCATE` — `TRUNCATE` is DDL in MariaDB and implicitly
+ * commits, which would defeat exactly that guarantee. (The same trap the spawn
+ * atlas import documents; at ~123k rows `DELETE` is still well under a second.)
+ */
+async function replaceAll(entries, meta) {
+  const conn = await core.pool.getConnection()
+  try {
+    await conn.beginTransaction()
+    await conn.query('DELETE FROM shard_clilocs')
+
+    // Blank entries are dropped rather than stored. Roughly HALF of a real
+    // cliloc table is empty strings — ids the client reserves and never uses —
+    // and a row that resolves to no name is indistinguishable from no row at
+    // all to every caller. Dropping them halves the table (123,490 → ~67,500)
+    // and, more importantly, makes the binary and text imports converge on
+    // identical content: the binary format carries the blanks explicitly and a
+    // text export may or may not, depending on the tool.
+    //
+    // Later duplicates win. Merging across sources already happened upstream in
+    // `readCliloc`, so in practice this collapses nothing — it is kept because
+    // the plain format permits a repeated id WITHIN one file and the client's
+    // own loader resolves it the same way (its dictionary assignment
+    // overwrites). Without it, a file the game itself would load happily would
+    // fail the batch insert on a primary-key collision.
+    const byNumber = new Map()
+    let blank = 0
+    for (const entry of entries) {
+      if (!Number.isInteger(entry.number)) continue
+      if (String(entry.text ?? '').trim() === '') {
+        blank++
+        continue
+      }
+      byNumber.set(entry.number, entry)
+    }
+
+    const rows = [...byNumber.values()].map((e) => [e.number, e.flag ?? 0, e.text])
+    for (let i = 0; i < rows.length; i += BATCH) {
+      await conn.batch('INSERT INTO shard_clilocs (number, flag, text) VALUES (?,?,?)', rows.slice(i, i + BATCH))
+    }
+
+    await conn.query(
+      'INSERT INTO shard_cliloc_meta (id, payload) VALUES (1, ?) ' +
+        'ON DUPLICATE KEY UPDATE payload = VALUES(payload), imported_at = CURRENT_TIMESTAMP',
+      [JSON.stringify({ ...meta, count: rows.length })],
+    )
+
+    await conn.commit()
+    return { count: rows.length, blank, duplicates: entries.length - blank - rows.length }
+  } catch (err) {
+    await conn.rollback().catch(() => {})
+    throw err
+  } finally {
+    conn.release()
+  }
+}
+
+async function getMeta() {
+  const rows = await query('SELECT payload, imported_at FROM shard_cliloc_meta WHERE id = 1')
+  if (rows.length === 0) return null
+  const payload = typeof rows[0].payload === 'string' ? JSON.parse(rows[0].payload) : rows[0].payload
+  return { ...payload, importedAt: rows[0].imported_at }
+}
+
+/**
+ * Look up a batch of ids.
+ *
+ * Batched rather than one-at-a-time because every caller has a LIST: a character
+ * sheet resolves a dozen equipment ids at once, and a page of marketplace
+ * listings resolves fifty. `IN (...)` with generated placeholders keeps it one
+ * round trip and one parameterized statement.
+ */
+async function lookup(numbers) {
+  if (!Array.isArray(numbers) || numbers.length === 0) return []
+  const ids = [...new Set(numbers.filter((n) => Number.isInteger(n)))]
+  if (ids.length === 0) return []
+  const placeholders = ids.map(() => '?').join(',')
+  return query(`SELECT number, text FROM shard_clilocs WHERE number IN (${placeholders})`, ids)
+}
+
+async function count() {
+  const rows = await query('SELECT COUNT(*) AS n FROM shard_clilocs')
+  return Number(rows[0]?.n) || 0
+}
+
+module.exports = {
+  replaceAll,
+  getMeta,
+  lookup,
+  count,
+}