Wiki Phase 1: categories, drafts/publish, HTML sanitization

Foundation & safety phase of the wiki upgrade (see WIKI_UPGRADE.md).

Schema (additive, idempotent via ensureSchema):
- new wiki_categories table; wiki_pages gains category_id, excerpt,
  published, published_at, sort_order, and a FULLTEXT index
- migration ALTERs guarded with IF NOT EXISTS for existing databases
- seed reworked into 4 sections with the 8 starter pages assigned

Security:
- new utils/sanitizeHtml.js (sanitize-html allowlist); wiki bodies are
  sanitized on every save, and the article renders through DOMPurify
- strips <script>, event handlers (onerror), and javascript: URLs

Backend:
- public: published-only list with ?category filter + /wiki/categories
- admin: extended page CRUD, PATCH publish toggle, category CRUD;
  drafts visible to admin, hidden from public
- all writes logged to activity_log

Frontend:
- data-driven public wiki index (sections + real descriptions; removed
  hardcoded blurbs/Roman numerals) with ?category filtering
- article: category breadcrumb + sanitized render
- admin: Section/Status columns, draft/publish + section + excerpt in the
  editor, and a Manage sections modal

Verified end-to-end against MariaDB 11: migration clean, XSS neutralized,
drafts hidden, client builds, server boots.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/db/seed.js

@@ -22,24 +22,39 @@ const DEFAULT_SETTINGS = {
   site_title: 'UOMysticmoon',
 }
 
-// The 8 starter wiki categories (editable later via the admin panel).
+// Starter wiki sections (editable later via the admin panel).
+// [slug, title, description, sort_order]
+const WIKI_CATEGORIES = [
+  ['guides', 'Guides', 'Getting started and how-to guides.', 10],
+  ['world', 'World & Lore', 'Regions, maps, and the story of Mysticmoon.', 20],
+  ['gameplay', 'Systems & Gameplay', 'Mechanics, items, monsters, and crafting.', 30],
+  ['community', 'Community & Rules', 'Player conduct and shard policies.', 40],
+]
+
+// The 8 starter pages, each mapped to a section. [slug, title, body, categorySlug]
 const WIKI_PAGES = [
-  ['new-player-guide', 'New Player Guide', 'First steps, basic survival, and early goals.'],
-  ['maps-atlas', 'Maps & Atlas', 'Regions, towns, routes, and travel notes.'],
-  ['systems', 'Server Systems', 'Shard mechanics and custom features.'],
-  ['items', 'Items & Rewards', 'Equipment, treasures, rewards, and curiosities.'],
-  ['monsters', 'Monsters & Encounters', 'Creatures, bosses, spawns, and dangers.'],
-  ['crafting', 'Crafting', 'Professions, materials, recipes, and tools.'],
-  ['lore', 'Lore', 'Stories, places, factions, and mysteries.'],
-  ['rules', 'Rules', 'Player conduct, shard expectations, and policies.'],
+  ['new-player-guide', 'New Player Guide', 'First steps, basic survival, and early goals.', 'guides'],
+  ['maps-atlas', 'Maps & Atlas', 'Regions, towns, routes, and travel notes.', 'world'],
+  ['lore', 'Lore', 'Stories, places, factions, and mysteries.', 'world'],
+  ['systems', 'Server Systems', 'Shard mechanics and custom features.', 'gameplay'],
+  ['items', 'Items & Rewards', 'Equipment, treasures, rewards, and curiosities.', 'gameplay'],
+  ['monsters', 'Monsters & Encounters', 'Creatures, bosses, spawns, and dangers.', 'gameplay'],
+  ['crafting', 'Crafting', 'Professions, materials, recipes, and tools.', 'gameplay'],
+  ['rules', 'Rules', 'Player conduct, shard expectations, and policies.', 'community'],
 ]
 
 async function seedDefaults() {
   for (const [key, value] of Object.entries(DEFAULT_SETTINGS)) {
     await settingsDb.seedDefault(key, value)
   }
-  for (const [slug, title, body] of WIKI_PAGES) {
+  for (const [slug, title, description, sortOrder] of WIKI_CATEGORIES) {
+    await wikiDb.seedDefaultCategory(slug, title, description, sortOrder)
+  }
+  for (const [slug, title, body, categorySlug] of WIKI_PAGES) {
     await wikiDb.seedDefault(slug, title, body)
+    // Attach to its section (only if not already categorized — safe re-run /
+    // migration of pages seeded before the wiki upgrade).
+    await wikiDb.assignCategoryBySlug(slug, categorySlug)
   }
   log.info('settings and wiki defaults ensured')
 }