chore: move build tools to devDependencies, shared deps to peerDependencies

tsup and typescript are only needed at build time — move to devDependencies
so they can be pruned after build. Dependencies already available from the
host Quartz installation are moved to peerDependencies to avoid duplication.

package.json

@@ -54,7 +54,8 @@
   },
   "peerDependencies": {
     "@jackyzha0/quartz": "^4.5.2",
-    "preact": "^10.0.0"
+    "preact": "^10.0.0",
+    "flexsearch": "^0.8.212"
   },
   "peerDependenciesMeta": {
     "@jackyzha0/quartz": {
@@ -62,14 +63,14 @@
     },
     "preact": {
       "optional": false
+    },
+    "flexsearch": {
+      "optional": true
     }
   },
   "dependencies": {
     "@quartz-community/types": "github:quartz-community/types",
-    "@quartz-community/utils": "github:quartz-community/utils",
-    "flexsearch": "^0.8.212",
-    "tsup": "^8.5.0",
-    "typescript": "^5.9.3"
+    "@quartz-community/utils": "github:quartz-community/utils"
   },
   "devDependencies": {
     "@types/flexsearch": "^0.7.6",
@@ -83,7 +84,9 @@
     "preact": "^10.28.2",
     "prettier": "^3.6.2",
     "sass": "^1.97.3",
-    "vitest": "^2.1.9"
+    "vitest": "^2.1.9",
+    "tsup": "^8.5.0",
+    "typescript": "^5.9.3"
   },
   "engines": {
     "node": ">=22",