fix: scope memory health diagnostics to allowed prefixes (#367)

When memoryAllowedPrefixes is configured, scan only those subdirectories instead of the entire MEMORY_PATH. Falls back to full scan if no prefixes are set.\n\nCloses #366

src/app/api/memory/health/route.ts

@@ -1,4 +1,6 @@
 import { NextRequest, NextResponse } from 'next/server'
+import { existsSync } from 'fs'
+import { join } from 'path'
 import { config } from '@/lib/config'
 import { requireRole } from '@/lib/auth'
 import { readLimiter } from '@/lib/rate-limit'
@@ -6,6 +8,35 @@ import { runHealthDiagnostics } from '@/lib/memory-utils'
 import { logger } from '@/lib/logger'
 
 const MEMORY_PATH = config.memoryDir
+const MEMORY_ALLOWED_PREFIXES = (config.memoryAllowedPrefixes || []).map((p) => p.replace(/\\/g, '/'))
+
+function mergeReports(reports: Awaited<ReturnType<typeof runHealthDiagnostics>>[]) {
+  const allCategories = reports.flatMap((report) => report.categories)
+  const mergedCategories = Array.from(new Set(allCategories.map((category) => category.name))).map((name) => {
+    const group = allCategories.filter((category) => category.name === name)
+    const score = Math.round(group.reduce((sum, category) => sum + category.score, 0) / group.length)
+    const status = score >= 80 ? 'healthy' : score >= 50 ? 'warning' : 'critical'
+    return {
+      name,
+      status,
+      score,
+      issues: group.flatMap((category) => category.issues).slice(0, 10),
+      suggestions: Array.from(new Set(group.flatMap((category) => category.suggestions))),
+    }
+  })
+
+  const overallScore = mergedCategories.length > 0
+    ? Math.round(mergedCategories.reduce((sum, category) => sum + category.score, 0) / mergedCategories.length)
+    : 100
+  const overall = overallScore >= 70 ? 'healthy' : overallScore >= 40 ? 'warning' : 'critical'
+
+  return {
+    overall,
+    overallScore,
+    categories: mergedCategories,
+    generatedAt: Date.now(),
+  }
+}
 
 export async function GET(request: NextRequest) {
   const auth = requireRole(request, 'viewer')
@@ -19,6 +50,17 @@ export async function GET(request: NextRequest) {
   }
 
   try {
+    if (MEMORY_ALLOWED_PREFIXES.length) {
+      const reports = []
+      for (const prefix of MEMORY_ALLOWED_PREFIXES) {
+        const folder = prefix.replace(/\/$/, '')
+        const fullPath = join(MEMORY_PATH, folder)
+        if (!existsSync(fullPath)) continue
+        reports.push(await runHealthDiagnostics(fullPath))
+      }
+      return NextResponse.json(reports.length > 0 ? mergeReports(reports) : await runHealthDiagnostics(MEMORY_PATH))
+    }
+
     const report = await runHealthDiagnostics(MEMORY_PATH)
     return NextResponse.json(report)
   } catch (err) {