feat: Add npm dependencies and update vendor paths

- Add package.json dependencies: jquery, jquery-ui, moment, daterangepicker, wavesurfer.js, air-datepicker
- Create scripts/setup-vendor.js to copy npm packages to public/assets/vendor
- Update view templates to use vendor paths instead of old /js/ or CDN URLs
- Clean up legacy commented-out scripts in master layout

add-packages.md

@@ -0,0 +1,15 @@
+* To add new packages, add a line below:
+```json
+    "new-package": "^1.2.3"
+```
+
+* If the npm name differs from vendor folder name: Also update the mapping in setup-vendor.js:
+```json
+    'npm-name': { folder: 'vendor-folder', subdir: 'dist' }
+```
+
+* Then regenerate lock file (do this locally, NOT in Docker)
+```bash
+    rm package-lock.json
+    docker run --rm -v "$PWD:/workspace" -w /workspace node:20 npm install --package-lock-only
+```