refactor: harden deps, fix geo math, and add engineering tooling

Replace xlsx with exceljs, unify CRS/DMS logic, move pages to views with shared map/toast composables, and add Vitest/ESLint/Prettier plus docs.

Co-authored-by: Cursor <cursoragent@cursor.com>

vite.config.js

@@ -11,4 +11,16 @@ export default defineConfig({
     open: false,           // 启动时不自动打开浏览器
   },
   base: '/geo-tools/',
+  build: {
+    rollupOptions: {
+      output: {
+        manualChunks: {
+          'vue-vendor': ['vue', 'vue-router'],
+          'geo-libs': ['@turf/area', '@turf/length', '@turf/helpers', 'proj4', 'gcoord'],
+          'ui-libs': ['lucide-vue-next', 'leaflet'],
+          'exceljs': ['exceljs']
+        }
+      }
+    }
+  }
 })