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/role.command.js

@@ -0,0 +1,71 @@
+const { PermissionFlagsBits, ApplicationCommandOptionType } = require('discord.js')
+
+const tempRoles = require('../../model/tempRoles')
+const { parseDuration } = require('../../utils/duration')
+
+module.exports = {
+  data: {
+    name: 'role',
+    description: 'Assign or remove a role for a single member.',
+    default_member_permissions: PermissionFlagsBits.ManageRoles.toString(),
+    options: [
+      {
+        name: 'add',
+        description: 'Add a role to a member, optionally temporary.',
+        type: ApplicationCommandOptionType.Subcommand,
+        options: [
+          { name: 'user', description: 'Member', type: ApplicationCommandOptionType.User, required: true },
+          { name: 'role', description: 'Role to add', type: ApplicationCommandOptionType.Role, required: true },
+          { name: 'duration', description: 'Optional — makes this temporary, e.g. 1h, 2d, 7d', type: ApplicationCommandOptionType.String, required: false },
+        ],
+      },
+      {
+        name: 'remove',
+        description: 'Remove a role from a member.',
+        type: ApplicationCommandOptionType.Subcommand,
+        options: [
+          { name: 'user', description: 'Member', type: ApplicationCommandOptionType.User, required: true },
+          { name: 'role', description: 'Role to remove', type: ApplicationCommandOptionType.Role, required: true },
+        ],
+      },
+    ],
+  },
+  async execute(interaction) {
+    const sub = interaction.options.getSubcommand()
+    const user = interaction.options.getUser('user', true)
+    const role = interaction.options.getRole('role', true)
+    const member = interaction.guild.members.cache.get(user.id)
+
+    if (!member) {
+      await interaction.reply({ content: 'That user is not a member of this server.', ephemeral: true })
+      return
+    }
+
+    if (sub === 'add') {
+      await member.roles.add(role.id)
+      const durationInput = interaction.options.getString('duration')
+      if (!durationInput) {
+        await interaction.reply({ content: `Added ${role} to ${user.tag}.`, ephemeral: true })
+        return
+      }
+      const ms = parseDuration(durationInput)
+      if (!ms) {
+        await interaction.reply({
+          content: `Added ${role}, but "${durationInput}" isn't a valid duration so it won't expire automatically. Use e.g. 1h, 2d, 7d.`,
+          ephemeral: true,
+        })
+        return
+      }
+      const expiresAt = new Date(Date.now() + ms)
+      await tempRoles.add({ guildId: interaction.guildId, userId: user.id, roleId: role.id, expiresAt, createdBy: interaction.user.id })
+      await interaction.reply({ content: `Added ${role} to ${user.tag} until ${expiresAt.toLocaleString()}.`, ephemeral: true })
+      return
+    }
+
+    if (sub === 'remove') {
+      await member.roles.remove(role.id)
+      await tempRoles.remove(interaction.guildId, user.id, role.id)
+      await interaction.reply({ content: `Removed ${role} from ${user.tag}.`, ephemeral: true })
+    }
+  },
+}