chore(website): remove partners marketplace route lint guard (#22121)

## Summary

Follow-up to #22120. Removes the `check-partners-marketplace-routes.mjs`
lint guard and its `project.json` wiring — the profile fix is just
`force-dynamic` on the page; the extra script is not needed.

## Changes

- Delete
`packages/twenty-website/scripts/check-partners-marketplace-routes.mjs`
- Restore `project.json` lint command to run only
`check-conventions.mjs` (as before #22120)

## Context

The guard was added in #22120 but the removal commit did not land before
merge. This PR cleans that up. No runtime behavior change.

## Test plan

- [ ] `nx lint twenty-website` (or CI) passes without the removed script

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packages/twenty-website/project.json

@@ -39,7 +39,7 @@
       "executor": "nx:run-commands",
       "options": {
         "cwd": "{projectRoot}",
-        "command": "node scripts/check-partners-marketplace-routes.mjs && node scripts/check-conventions.mjs && npx oxlint -c .oxlintrc.json . && npx oxfmt --check ."
+        "command": "node scripts/check-conventions.mjs && npx oxlint -c .oxlintrc.json . && npx oxfmt --check ."
       },
       "configurations": {
         "fix": {

packages/twenty-website/scripts/check-partners-marketplace-routes.mjs

@@ -1,31 +0,0 @@
-import fs from 'fs';
-import path from 'path';
-import { fileURLToPath } from 'url';
-
-const root = path.join(path.dirname(fileURLToPath(import.meta.url)), '..');
-const routes = [
-  'src/app/[locale]/(site)/partners/list/page.tsx',
-  'src/app/[locale]/(site)/partners/profile/[slug]/page.tsx',
-];
-
-const failures = [];
-
-for (const relativePath of routes) {
-  const fullPath = path.join(root, relativePath);
-  const source = fs.readFileSync(fullPath, 'utf8');
-  if (!/export const dynamic = 'force-dynamic';/.test(source)) {
-    failures.push(
-      `${relativePath}: must export dynamic = 'force-dynamic' (OpenNext runtime fetch; build has no TWENTY_PARTNERS_API_KEY).`,
-    );
-  }
-}
-
-if (failures.length > 0) {
-  console.error('check-partners-marketplace-routes: FAILED');
-  for (const failure of failures) {
-    console.error(`  ${failure}`);
-  }
-  process.exit(1);
-}
-
-console.log('check-partners-marketplace-routes: OK');