GroupVerify: Verification page, overrides and public Verified tags

Shown only where GroupVerify is: staff get the Verification page once its gv_* tables are in
the database, and the public site shows "Verified" only while it's on (enabled, with a group)
and not missing from css_plugins list, which the poller reads once a minute over RCON.

- Verification page: plugin state and version, Steam group, saved member list, overrides.
- Overrides (@zio/verify, not on yourself unless Root): give, change, remove; player drawer
  shows why a player is or isn't verified.
- Root sets the group and turns it on/off: saved to gv_settings, and sent as css_gv_* when the
  plugin is loaded so it applies at once.
- gv_* times use GroupVerify's own timezone setting.
- MySQL integration test (SAW_TEST_DSN), unit tests for plugin list parsing and the show rule.

internal/web/assets/public.js

@@ -38,7 +38,7 @@ async function server() {
         <thead><tr><th>Player</th><th class="num">Kills</th><th class="num">Deaths</th><th class="num hide-sm">Ping</th></tr></thead>
         <tbody>
         ${list.map((p) => `<tr ${p.bot ? "" : `class="clickable" data-player="${esc(p.steamid)}"`}>
-          <td><div class="who"><div><b>${esc(p.name)}</b>${p.bot ? '<span class="sid">Bot</span>' : p.rank ? rankTag(p.rank) : ""}</div></div></td>
+          <td><div class="who"><div><b>${esc(p.name)}</b>${p.verified ? ` ${VERIFIED_TAG}` : ""}${p.bot ? '<span class="sid">Bot</span>' : p.rank ? rankTag(p.rank) : ""}</div></div></td>
           <td class="num">${p.kills}</td>
           <td class="num">${p.deaths}</td>
           <td class="num hide-sm muted">${p.bot ? "" : p.ping}</td>
@@ -238,8 +238,8 @@ async function openPlayer(sid) {
       <div><h2>${esc(name)}</h2><span class="sid">${esc(p.steamid)} · <a href="${steamProfile(p.steamid)}" target="_blank" rel="noopener">Steam profile</a></span>${p.rank ? `<div>${rankTag(p.rank)}</div>` : ""}</div>
       <button class="close" type="button" data-close aria-label="Close">×</button>
     </div>
-    ${now.length || p.online ? `<section>
-      <div class="chips">${p.online ? '<span class="tag">On the server</span>' : ""}${now.map((h) => `<span class="tag ${h.kind === "ban" ? "red" : "amber"}">${h.kind === "ban" ? "Banned" : COMM_HELP[h.type]}${h.duration ? `, ${fmtLeft(served(h).left)}` : ", permanently"}</span>`).join("")}</div>
+    ${now.length || p.online || p.verified ? `<section>
+      <div class="chips">${p.verified ? VERIFIED_TAG : ""}${p.online ? '<span class="tag">On the server</span>' : ""}${now.map((h) => `<span class="tag ${h.kind === "ban" ? "red" : "amber"}">${h.kind === "ban" ? "Banned" : COMM_HELP[h.type]}${h.duration ? `, ${fmtLeft(served(h).left)}` : ", permanently"}</span>`).join("")}</div>
     </section>` : ""}
     <section>
       <h3>History</h3>