refactor: centralize section config — remove all hardcoded section lists

- New packages/config/src/sections.ts: SECTIONS, SECTIONS_BY_ID, SECTION_IDS
  (no Node.js built-in imports — safe for client components)
- New package entrypoint: @mcpedia/config/sections (exports only sections.ts)
- Client components import from @mcpedia/config/sections (no node:fs in bundle)
- Server components import from @mcpedia/config (has env/fs, server-only)
- Removed hardcoded SECTIONS/SECTION_LABEL/SECTION_ICON from:
  - [section]/page.tsx (was inline array)
  - [section]/[...slug]/page.tsx (was hardcoded Record maps)
  - Sidebar.tsx (was inline array)
  - layout.tsx (was inline array)
  - page.tsx (was inline array)
  - create/page.tsx (was inline array via SECTIONS import)
- Added @mcpedia/config/sections entrypoint to package.json exports

apps/web/app/globals.css

@@ -72,3 +72,17 @@ body {
 .prose tbody tr:nth-child(even) {
   background: rgba(15, 16, 17, 0.5);
 }
+
+/* Inline code in prose */
+.prose code {
+  font-family: var(--font-mono);
+  font-size: 0.85em;
+}
+
+/* Blockquote styling */
+.prose blockquote {
+  border-left: 2px solid var(--color-border);
+  margin: 1.5em 0;
+  padding: 0.25em 1em;
+  font-style: italic;
+}