Add uo-link WS ingest, storage tables and SSE broadcaster (phase 1)

The site now ingests the sidecar's live WebSocket feed and persists it to its
own MariaDB, and re-broadcasts curated events to browsers over SSE.

- schema: shard_events (append-only notable-kind log, sha1 dedupe_key +
  INSERT IGNORE for idempotent reconnect backfill), shard_online (current
  players, upsert/refresh/remove), shard_economy (gold-supply series),
  shard_houses (per-house decay stage + derived is_idoc).
- model/shardEvents + model/shardState: the .db.js/.model.js split; writes
  take camelCase event data, reads are shaped; online upsert uses COALESCE so
  a partial char.vitals refresh never blanks login fields.
- utils/shardIngest: single dispatcher routing each kind to state writes
  and/or the event log, then the broadcaster. High-frequency kinds
  (char.vitals, economy.supply) update state only. A changed server.hello
  bootId clears the stale online roster. Deps are injected for unit testing.
- utils/uoLinkSocket: the server's first outbound WS client (ws dep). Verifies
  the ws.hello protocol, backfills via /history + /economy on every
  (re)connect (dedupe handles overlap), reconnects with capped backoff, and
  mirrors connection state into uo_link_config. Self-guards: only connects when
  the integration is enabled with a token.
- utils/shardBroadcast: SSE fan-out with public (safe kinds only) and admin
  (all) channels, keepalive pings, per-client cleanup.
- server.js: start the ingest socket on boot (no-op until configured) and stop
  it + close SSE streams on graceful shutdown.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011qPmpmVH1xGCiZoz9m9vW3

server/src/model/shardState/shardState.model.js

@@ -0,0 +1,141 @@
+// Live shard state derived from the WS feed: who is online, the gold-supply
+// series, and per-house decay stage. The ingest dispatcher calls the write
+// methods; the public read endpoints call the list/count methods. Writes take
+// camelCase semantic objects and map to the snake_case columns; only the keys
+// present are written (so a char.vitals refresh doesn't clobber login fields).
+
+const db = require('./shardState.db')
+
+const MAX_ECONOMY = 1000
+
+// Map a camelCase online descriptor to DB columns, dropping undefined keys so a
+// partial refresh only touches the fields it carries.
+function onlineFields(data) {
+  const map = {
+    name: data.name,
+    acct: data.acct,
+    web_id: data.webId,
+    map: data.map,
+    x: data.x,
+    y: data.y,
+    z: data.z,
+    hits: data.hits,
+    hits_max: data.hitsMax,
+    mana: data.mana,
+    mana_max: data.manaMax,
+    stam: data.stam,
+    stam_max: data.stamMax,
+    str: data.str,
+    dex: data.dex,
+    int: data.int,
+  }
+  const fields = {}
+  for (const [k, v] of Object.entries(map)) if (v !== undefined) fields[k] = v
+  return fields
+}
+
+// Upsert an online player (mob.login) or refresh their vitals (char.vitals).
+async function upsertOnline(data) {
+  if (!data || !data.serial) return
+  await db.upsertOnline(data.serial, onlineFields(data))
+}
+
+const setOffline = (serial) => db.removeOnline(serial)
+const clearOnline = () => db.clearOnline()
+const onlineCount = () => db.countOnline()
+
+async function listOnline() {
+  const rows = await db.listOnline()
+  return rows.map((r) => ({
+    serial: r.serial,
+    name: r.name,
+    acct: r.acct,
+    webId: r.web_id,
+    map: r.map,
+    x: r.x,
+    y: r.y,
+    z: r.z,
+    hits: r.hits,
+    hitsMax: r.hits_max,
+    mana: r.mana,
+    manaMax: r.mana_max,
+    stam: r.stam,
+    stamMax: r.stam_max,
+    str: r.str,
+    dex: r.dex,
+    int: r.int,
+    updatedAt: r.updated_at,
+  }))
+}
+
+// Append a gold-supply sample (economy.supply).
+async function addEconomySample({ accounts, gold, t }) {
+  await db.insertEconomy({ accounts, gold, t })
+}
+
+async function listEconomy(limit = 100) {
+  const n = Math.min(Math.max(Number(limit) || 100, 1), MAX_ECONOMY)
+  const rows = await db.listEconomy(n)
+  // Return oldest → newest for charting.
+  return rows
+    .map((r) => ({ accounts: r.accounts, gold: r.gold == null ? null : Number(r.gold), t: r.t }))
+    .reverse()
+}
+
+async function latestEconomy() {
+  const r = await db.latestEconomy()
+  return r ? { accounts: r.accounts, gold: r.gold == null ? null : Number(r.gold), t: r.t } : null
+}
+
+// Upsert a house's decay stage (house.decay). is_idoc is derived from the stage.
+async function upsertHouse(data) {
+  if (!data || !data.serial) return
+  const fields = {
+    stage: data.stage ?? null,
+    map: data.map ?? null,
+    x: data.x ?? null,
+    y: data.y ?? null,
+    z: data.z ?? null,
+    region: data.region ?? null,
+    name: data.name ?? null,
+    owner_serial: data.ownerSerial ?? null,
+    owner_acct: data.ownerAcct ?? null,
+    built_on: data.builtOn ? new Date(data.builtOn) : null,
+    last_refreshed: data.lastRefreshed ? new Date(data.lastRefreshed) : null,
+    is_idoc: String(data.stage).toUpperCase() === 'IDOC' ? 1 : 0,
+  }
+  await db.upsertHouse(data.serial, fields)
+}
+
+async function listIdoc() {
+  const rows = await db.listIdocHouses()
+  return rows.map((r) => ({
+    serial: r.serial,
+    stage: r.stage,
+    map: r.map,
+    x: r.x,
+    y: r.y,
+    z: r.z,
+    region: r.region,
+    name: r.name,
+    ownerSerial: r.owner_serial,
+    ownerAcct: r.owner_acct,
+    builtOn: r.built_on,
+    lastRefreshed: r.last_refreshed,
+    isIdoc: Boolean(r.is_idoc),
+    updatedAt: r.updated_at,
+  }))
+}
+
+module.exports = {
+  upsertOnline,
+  setOffline,
+  clearOnline,
+  onlineCount,
+  listOnline,
+  addEconomySample,
+  listEconomy,
+  latestEconomy,
+  upsertHouse,
+  listIdoc,
+}