release: v0.1.4 — parser enhancement, new syntax, performance optimization

feat(parser): comprehensive Markdown parser enhancement
- Add nested list support (multi-level unordered/ordered, mixed nesting)
- Add Setext headings (=== / ---)
- Add indented code blocks (4-space indent)
- Add HTML comment passthrough (<!-- -->)
- Add entity reference protection (&amp; &#169;)
- Add ordered list start attribute
- Add link title single-quote support
- Add LaTeX math formulas ($inline$ / $$block$$)
- Add footnote support ([^1] ref + [^1]: definition)
- Add definition lists (term\n: definition)
- Extend emoji map from 85 to 150+ common emojis
- Fix backtick code block matching (CommonMark spec)
- Fix italic regex character truncation (lookbehind assertions)
- Fix superscript/subscript/strikethrough ambiguity
- Fix blockquote prefix handling (>text without space)
- Enhance safeUrl filtering (additional protocol checks)
- Enhance slugify (Unicode NFKC normalization)

perf(parser): single-pass inline scanning, render cache, pre-compiled regex
- Replace 14-step chained regex with unified single-pass scanInline()
- Add cachedRenderInline() with FIFO LRU eviction (300-entry cap)
- Pre-compile 15+ static regex constants for block boundary detection
- Skip redundant style='text-align:left' on default-aligned table cells

style(parser): add CSS for footnotes, definition lists, math formulas, sup/sub

test(parser): 44 new test cases covering all v0.1.4 syntax additions (469 total)

chore: bump version 0.1.3 → 0.1.4 across all source files, docs, site pages

types/index.d.ts

@@ -1,4 +1,4 @@
-// Type definitions for MetonaEditor
+// Type definitions for MetonaEditor v0.1.4
 // Project: https://git.metona.cn/MetonaTeam/MetonaEditor
 // Author: thzxx
 
@@ -243,10 +243,12 @@ export function getStatus(): {
 // ============ 解析器 ============
 /** Markdown 解析函数 */
 export function parseMarkdown(markdown: string, env?: RenderEnv): string;
-/** URL 安全过滤 */
+/** URL 安全过滤（增强版） */
 export function safeUrl(url: string): string;
-/** 生成标题锚点 id */
+/** 生成标题锚点 id（Unicode NFKC 规范化） */
 export function slugify(text: string): string;
+/** 清除渲染缓存（主题切换等场景） */
+export function clearRenderCache(): void;
 
 // ============ 插件 ============
 /** 预设插件表 */