feat: Add Markdown to ProseMirror converter

- New converter supports headings, lists, blockquotes, code blocks
- Documents now render with proper formatting in Outline
- Auto-update collection documentStructure on document creation
- Documents appear in sidebar automatically

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/index.ts

@@ -39,7 +39,7 @@ async function main() {
   // Create MCP server with shared configuration
   const server = createMcpServer(pgClient.getPool(), {
     name: 'mcp-outline-postgresql',
-    version: '1.3.13'
+    version: '1.3.14'
   });
 
   // Connect stdio transport