refactor: complete three-layer serial refactoring (knowledge→schema→renderer)

Step 1 — Knowledge base: perfect all reference/*.md with type, range, default, unit
- text.md: add DataOrPathProps, path/data, bullet deprecated params
- chart.md: add deprecated section, fix 19 params with missing elements
- slide.md: add bkgd→background deprecated mapping
- output.md: add masterSlide, presLayout

Step 2 — Schema: align schema/presentation.schema.json with KB
- Add catAxisItem and valAxisItem definitions with full sub-property constraints
- Fix 7 enum constraints (barDir, displayBlanksAs, bar3DShape, etc.)
- Add 4 missing fields (verbose, autoPageCharWeight, autoPageLineWeight, notes,
  masterSlide, presLayout)

Step 3 — Translation engine: transform renderers from passthrough to validation
- index.js: add normalizePosition, normalizeColor, validateEnum shared utilities
- All renderers: position validation, color hex normalization, enum validation
- Image: graceful failure handling (catch load errors, warn, continue)
- Chart: chartType enum validation, data parity check
- Table: colspan/rowspan integer validation, border array check
- Full verification: basic.json and full.json generate valid PPTX

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

reference/output.md

@@ -154,3 +154,11 @@ type WRITE_OUTPUT_TYPE = JSZIP_OUTPUT_TYPE | 'STREAM'
 
 - **title**：演示文稿标题
   - 类型：`string`
+
+- **masterSlide**：当前母版
+  - 类型：`PresSlide`
+  - 说明：当前演示文稿的母版幻灯片对象
+
+- **presLayout**：布局信息
+  - 类型：`PresLayout`
+  - 说明：只读，包含 `name`（布局名称）、`width`（宽度，英寸）、`height`（高度，英寸）