Add Discord bot (moderation, filters, scheduling, roles, invites, site integration)

Standalone bot/ service (its own package.json/Dockerfile) managed entirely
through a new admin-only Discord Bot panel — token stored encrypted in the
DB and pushed to the bot process in-memory, never an env var. Built in
phases, each independently verified against a live Discord guild:

- Bot skeleton: gateway connection, internal shared-secret API, self-heals
  on its own restart by pulling config from the site
- Moderation core: /ban /kick /mute /warn /warnings + mod-log channel
- Word/invite/spam filtering with leetspeak-resistant normalization and a
  staff role/channel allowlist
- Scheduled messages: recurring (cron) and one-off channel posts
- Role assignment: button role menus, auto-role on join, temp roles,
  bulk role ops
- Auto-rotating primary invite with an audit log
- Site integration: news-publish -> Discord announce webhook, manual
  /announce, read-only /wiki search

Also fixes a pre-existing bug in both DB pools (server + bot): the mariadb
driver defaulted to timezone 'local', silently mis-serializing bound Date
params by the host's local offset instead of the DB's UTC session.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

bot/src/discord/commands/roles.command.js

@@ -0,0 +1,68 @@
+const { PermissionFlagsBits, ApplicationCommandOptionType } = require('discord.js')
+
+// Bulk targeting is "by existing role" only — the spec also mentions an
+// explicit list of members, but Discord slash commands have no multi-user
+// picker, so that variant is deferred rather than faked with a handful of
+// user1..user5 options that would feel arbitrary and cramped.
+module.exports = {
+  data: {
+    name: 'roles',
+    description: 'Bulk role operations across members who share an existing role.',
+    default_member_permissions: PermissionFlagsBits.ManageRoles.toString(),
+    options: [
+      {
+        name: 'bulk-assign',
+        description: 'Add a role to every member who has another role.',
+        type: ApplicationCommandOptionType.Subcommand,
+        options: [
+          { name: 'has-role', description: 'Members with this role are targeted', type: ApplicationCommandOptionType.Role, required: true },
+          { name: 'add-role', description: 'Role to add to those members', type: ApplicationCommandOptionType.Role, required: true },
+        ],
+      },
+      {
+        name: 'bulk-remove',
+        description: 'Remove a role from every member who has another role.',
+        type: ApplicationCommandOptionType.Subcommand,
+        options: [
+          { name: 'has-role', description: 'Members with this role are targeted', type: ApplicationCommandOptionType.Role, required: true },
+          { name: 'remove-role', description: 'Role to remove from those members', type: ApplicationCommandOptionType.Role, required: true },
+        ],
+      },
+    ],
+  },
+  async execute(interaction) {
+    const sub = interaction.options.getSubcommand()
+    // Fetching every member + looping role updates can easily exceed
+    // Discord's 3-second initial-response window.
+    await interaction.deferReply({ ephemeral: true })
+
+    const hasRole = interaction.options.getRole('has-role', true)
+    const members = await interaction.guild.members.fetch()
+    const targets = members.filter((m) => m.roles.cache.has(hasRole.id))
+
+    if (sub === 'bulk-assign') {
+      const addRole = interaction.options.getRole('add-role', true)
+      let count = 0
+      for (const member of targets.values()) {
+        if (!member.roles.cache.has(addRole.id)) {
+          await member.roles.add(addRole.id).catch(() => {})
+          count++
+        }
+      }
+      await interaction.editReply({ content: `Added ${addRole} to ${count} member(s) who have ${hasRole}.` })
+      return
+    }
+
+    if (sub === 'bulk-remove') {
+      const removeRole = interaction.options.getRole('remove-role', true)
+      let count = 0
+      for (const member of targets.values()) {
+        if (member.roles.cache.has(removeRole.id)) {
+          await member.roles.remove(removeRole.id).catch(() => {})
+          count++
+        }
+      }
+      await interaction.editReply({ content: `Removed ${removeRole} from ${count} member(s) who have ${hasRole}.` })
+    }
+  },
+}