feat: add ReactiveStatManager for markdown template support

Introduce ReactiveStatManager to allow dynamic stat replacement within
rendered markdown content. This component scans the article DOM for
`${key}` patterns and reactively updates them based on the journal
stream.

As part of this change, the SVG-based StatSheet system is removed in
favor of this more flexible text-based approach.

src/cli/commands/serve.ts

@@ -19,7 +19,6 @@ import {
   scanDirectives,
   type DirectiveScanResult,
 } from "../completions/directive-scanner.js";
-import type { StatSheet } from "../completions/types.js";
 
 interface ContentIndex {
   [path: string]: string;
@@ -88,22 +87,6 @@ function getBestIP(): string {
   return best || "localhost";
 }
 
-/**
- * 从 SVG 字符串中提取 <title> 内容，无则返回 null
- */
-function extractSvgTitle(svg: string): string | null {
-  const m = /<title[^>]*>([\s\S]*?)<\/title>/i.exec(svg);
-  return m ? m[1].trim() : null;
-}
-
-/**
- * 从文件名生成可读标签
- * 如 "character-sheet" -> "Character Sheet"
- */
-function labelFromId(id: string): string {
-  return id.replace(/[-_]/g, " ").replace(/\b\w/g, (c) => c.toUpperCase());
-}
-
 /**
  * 扫描目录内的 .md 等文件，生成内容索引与块数据
  */
@@ -116,7 +99,6 @@ export function scanDirectory(dir: string): {
   const blocks: ProcessedBlocks = {
     stats: [],
     statTemplates: [],
-    statSheets: [],
   };
   const directiveResults: DirectiveScanResult[] = [];
   const mdFiles: { content: string; relPath: string }[] = [];
@@ -148,17 +130,6 @@ export function scanDirectory(dir: string): {
             blocks.stats.push(...result.blocks.stats);
             blocks.statTemplates.push(...result.blocks.statTemplates);
             mdFiles.push({ content: result.stripped, relPath: normalizedRelPath });
-          } else if (entry.endsWith(".sheet.svg")) {
-            index[normalizedRelPath] = content;
-            const id = entry.replace(/\.sheet\.svg$/i, "");
-            const title = extractSvgTitle(content);
-            const sheet: StatSheet = {
-              id,
-              label: title || labelFromId(id),
-              svg: content,
-              source: normalizedRelPath,
-            };
-            blocks.statSheets.push(sheet);
           } else {
             index[normalizedRelPath] = content;
           }
@@ -341,7 +312,6 @@ export function createContentServer(
   let collectedBlocks: ProcessedBlocks = {
     stats: [],
     statTemplates: [],
-    statSheets: [],
   };
   let directiveResults: DirectiveScanResult[] = [];
   let completionsIndex: CompletionsPayload = {
@@ -350,14 +320,13 @@ export function createContentServer(
     sparkTables: [],
     stats: [],
     statTemplates: [],
-    statSheets: [],
   };
 
   /** 从当前内容索引和已收集的块重新扫描补全数据 */
   function recomputeCompletions(): void {
     completionsIndex = scanCompletions(contentIndex, collectedBlocks, directiveResults);
     console.log(
-      `[completions] dice=${completionsIndex.dice.length} links=${completionsIndex.links.length} sparkTables=${completionsIndex.sparkTables.length} stats=${completionsIndex.stats.length} templates=${completionsIndex.statTemplates.length} sheets=${completionsIndex.statSheets.length}`,
+      `[completions] dice=${completionsIndex.dice.length} links=${completionsIndex.links.length} sparkTables=${completionsIndex.sparkTables.length} stats=${completionsIndex.stats.length} templates=${completionsIndex.statTemplates.length}`,
     );
   }
 
@@ -399,12 +368,6 @@ export function createContentServer(
             recomputeCompletions();
           } else {
             contentIndex[relPath] = content;
-            if (relPath.endsWith(".sheet.svg")) {
-              const rescan = scanDirectory(contentDir);
-              collectedBlocks = rescan.blocks;
-              directiveResults = rescan.directiveResults;
-              recomputeCompletions();
-            }
           }
           console.log(`[新增] ${relPath}`);
         } catch (e) {
@@ -431,12 +394,6 @@ export function createContentServer(
             recomputeCompletions();
           } else {
             contentIndex[relPath] = content;
-            if (relPath.endsWith(".sheet.svg")) {
-              const rescan = scanDirectory(contentDir);
-              collectedBlocks = rescan.blocks;
-              directiveResults = rescan.directiveResults;
-              recomputeCompletions();
-            }
           }
           console.log(`[更新] ${relPath}`);
         } catch (e) {
@@ -454,7 +411,7 @@ export function createContentServer(
         const relPath = "/" + relative(contentDir, path).split(sep).join("/");
         delete contentIndex[relPath];
         console.log(`[删除] ${relPath}`);
-        if (relPath.endsWith(".md") || relPath.endsWith(".sheet.svg")) {
+        if (relPath.endsWith(".md")) {
           const rescan = scanDirectory(contentDir);
           collectedBlocks = rescan.blocks;
           directiveResults = rescan.directiveResults;