Add Wiki feature with Markdown, categories, tags, and search

- wiki_categories, wiki_pages, wiki_tags, wiki_page_tags tables
- /wiki overview with category-grouped pages, tag sidebar, search
- /wiki/new create page with Markdown editor and live preview
- /wiki/[slug] view page with rendered Markdown, tags, edit/delete
- /wiki/[slug]/edit with pre-populated editor
- Tag input with existing tag suggestions (click to add)
- Category management (add/delete) in sidebar
- Tailwind Typography plugin for prose styling
- marked package for Markdown rendering
- Sidebar nav item with book icon

Run db:push on server to create wiki tables.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -18,10 +18,12 @@
 		"@node-rs/argon2": "^2.0.2",
 		"@oslojs/crypto": "^1.0.1",
 		"@oslojs/encoding": "^1.1.0",
+		"@tailwindcss/typography": "^0.5.19",
 		"bwip-js": "^4.9.0",
 		"date-fns": "^4.1.0",
 		"dotenv": "^17.4.1",
 		"drizzle-orm": "^0.38.4",
+		"marked": "^18.0.0",
 		"pg": "^8.13.1",
 		"qrcode": "^1.5.4",
 		"sharp": "^0.33.5",