feat(core): dynamic custom frontmatter fields for CTF writeup metadata

- Add extra_fields JSONB column to documents table (migration 0003)
- CreateDocInput/UpdateDocInput: extraFields?: Record<string, string>
- parseFile: extracts non-standard frontmatter keys as extraFields
- stringifyFile: writes extraFields dynamically to YAML frontmatter
- toMeta: spreads extraFields from DB row into DocumentMeta
- DocForm: '+ Add field' UI for content creators to add any metadata
- API routes: splitPayload() separates standard vs custom fields
- Doc page: CustomFieldBadges dynamically renders any custom field
- Add db:migrate / db:push scripts + deploy workflow migration step
- Add CTF writeup template (content/writeups/ctf/template/)
- Add sample DEF CON writeup with event/challenge/category/difficulty/points
- Add @tailwindcss/typography for table rendering (prose classes)
- Add remark-gfm for GitHub Flavored Markdown table parsing

packages/search/src/index.ts

@@ -32,6 +32,7 @@ const VALID_TYPES: DocType[] = ["documentation", "writeup", "research", "note"];
 
 /** Map a Drizzle row (text columns, Date timestamps) into the strict types. */
 function toMeta(row: DocumentRow): DocumentMeta {
+  const extra = row.extraFields as Record<string, unknown> | null;
   return {
     id: row.id,
     slug: row.slug,
@@ -46,6 +47,8 @@ function toMeta(row: DocumentRow): DocumentMeta {
     path: row.path,
     createdAt: row.createdAt.toISOString(),
     updatedAt: row.updatedAt.toISOString(),
+    // Spread dynamic extra fields (CTF: event, challenge, category, difficulty, points, etc.)
+    ...(extra ?? {}),
   };
 }