feat: migrate to npm specifiers with type-safe plugin index

- Default config and all 4 templates use @quartz-community/* npm specifiers
- config-loader: npm packages imported directly (not via .quartz/plugins/ paths)
- gitLoader: regeneratePluginIndex cross-references .d.ts with .js to correctly
  classify type-only exports, preventing runtime 'does not provide export' errors
- All 44 default plugins added as dependencies
- Locally tested: 111 docs files → 374 output files, zero errors

package.json

@@ -41,6 +41,50 @@
     "@floating-ui/dom": "^1.7.4",
     "@myriaddreamin/rehype-typst": "^0.6.0",
     "@napi-rs/simple-git": "0.1.22",
+    "@quartz-community/alias-redirects": "*",
+    "@quartz-community/article-title": "*",
+    "@quartz-community/backlinks": "*",
+    "@quartz-community/bases-page": "*",
+    "@quartz-community/breadcrumbs": "*",
+    "@quartz-community/canvas-page": "*",
+    "@quartz-community/citations": "*",
+    "@quartz-community/cname": "*",
+    "@quartz-community/comments": "*",
+    "@quartz-community/content-index": "*",
+    "@quartz-community/content-meta": "*",
+    "@quartz-community/content-page": "*",
+    "@quartz-community/crawl-links": "*",
+    "@quartz-community/created-modified-date": "*",
+    "@quartz-community/darkmode": "*",
+    "@quartz-community/description": "*",
+    "@quartz-community/encrypted-pages": "*",
+    "@quartz-community/explicit-publish": "*",
+    "@quartz-community/explorer": "*",
+    "@quartz-community/favicon": "*",
+    "@quartz-community/folder-page": "*",
+    "@quartz-community/footer": "*",
+    "@quartz-community/github-flavored-markdown": "*",
+    "@quartz-community/graph": "*",
+    "@quartz-community/hard-line-breaks": "*",
+    "@quartz-community/latex": "*",
+    "@quartz-community/note-properties": "*",
+    "@quartz-community/obsidian-flavored-markdown": "*",
+    "@quartz-community/og-image": "*",
+    "@quartz-community/ox-hugo": "*",
+    "@quartz-community/page-title": "*",
+    "@quartz-community/quartz-fonts": "*",
+    "@quartz-community/reader-mode": "*",
+    "@quartz-community/recent-notes": "*",
+    "@quartz-community/remove-draft": "*",
+    "@quartz-community/roam": "*",
+    "@quartz-community/search": "*",
+    "@quartz-community/spacer": "*",
+    "@quartz-community/stacked-pages": "*",
+    "@quartz-community/syntax-highlighting": "*",
+    "@quartz-community/table-of-contents": "*",
+    "@quartz-community/tag-list": "*",
+    "@quartz-community/tag-page": "*",
+    "@quartz-community/unlisted-pages": "*",
     "ansi-truncate": "^1.4.0",
     "async-mutex": "^0.5.0",
     "chokidar": "^5.0.0",