docs(core): update server boundary rules and fix db import paths

- document `.server.js` suffix requirement for node-only imports in DEV.md
- add client-safe subentries table and server-only barrel warnings in MODULES.md
- fix `crud.js` and `database/index.js` to import from `db.server.js`
- replace `createRequire` with `pathToFileURL` in `discover.server.js` for ESM-only modules
- update admin navigation and registry to use safe client-compatible imports
- bump version to 1.4.132

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@zen/core",
-  "version": "1.4.131",
+  "version": "1.4.132",
   "description": "Une plateforme multi-usage construite sur l'essentiel, rien de plus, rien de moins.",
   "repository": {
     "type": "git",