feat(guide): tabbed markdown reader — retire CRUD GuidesView (Phase 2, Refs #1)

New GuideReader.svelte: nav tree (apps→modules) + tabbed markdown (marked),
audience-gated server-side (admins see internal tabs, badged). Replaces the old
DB-CRUD GuidesView. Consumes GET /api/v1/guide/nav + /modules/{module}.
Deployed to guide.bcos.dev.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/package-lock.json

@@ -8,7 +8,8 @@
       "name": "hiveops-guide-frontend",
       "version": "1.0.0",
       "dependencies": {
-        "axios": "^1.6.0"
+        "axios": "^1.6.0",
+        "marked": "^12.0.0"
       },
       "devDependencies": {
         "@sveltejs/vite-plugin-svelte": "^3.0.0",
@@ -1578,6 +1579,18 @@
         "@jridgewell/sourcemap-codec": "^1.5.5"
       }
     },
+    "node_modules/marked": {
+      "version": "12.0.2",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-12.0.2.tgz",
+      "integrity": "sha512-qXUm7e/YKFoqFPYPa3Ukg9xlI5cyAtGmyEIzMfW//m6kXwCy2Ps9DYf5ioijFKQ8qyuscrHoY04iJGctu2Kg0Q==",
+      "license": "MIT",
+      "bin": {
+        "marked": "bin/marked.js"
+      },
+      "engines": {
+        "node": ">= 18"
+      }
+    },
     "node_modules/math-intrinsics": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/math-intrinsics/-/math-intrinsics-1.1.0.tgz",