docs: add low-level drawing API documentation

- Add content/docs/advanced/low-level-drawing.mdx with comprehensive guide
  covering operators, gradients, patterns, transforms, and Form XObjects
- Update api/pdf.mdx with new resource creation methods
- Update api/pdf-page.mdx with drawOperators and register* methods
- Update guides/drawing.mdx with pattern fills section
- Update advanced/meta.json navigation
- Add tmp to lint/format ignore patterns

Author: Mythie

.oxfmtrc.json

@@ -21,5 +21,5 @@
     ]
   },
   "experimentalSortPackageJson": true,
-  "ignorePatterns": ["dist", "node_modules", "checkouts", ".docs"]
+  "ignorePatterns": ["dist", "node_modules", "checkouts", "tmp", ".docs"]
 }

.oxlintrc.json

@@ -42,5 +42,5 @@
       }
     }
   ],
-  "ignorePatterns": ["dist", "node_modules", "checkouts", ".docs"]
+  "ignorePatterns": ["dist", "node_modules", "checkouts", "tmp", ".docs"]
 }