enhance: inherit team access for all units (#38938)

Admin and write team authorize now grant that mode on every unit,
including units added later, instead of only rows present in
`team_unit`. Granular teams keep `authorize=none` and explicit unit
rows.

Closes the `TEAM-UNIT-PERMISSION` design gap from
https://github.com/go-gitea/gitea/pull/34128.

Maybe also fix #15962 (actually maybe it had been fixed before, the root
cause is out-of-sync "access" table)


## Screenshots

only writing selected:
<img width="1399" height="1007" alt="image"
src="https://github.com/user-attachments/assets/1d1b4c49-a59a-47b6-998f-0464a067395b"
/>


_Created with the help of AI_

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/features/org-team.ts

@@ -7,7 +7,7 @@ function initOrgTeamSettings() {
   queryElems(pageContent, 'input[name=permission]', (el) => el.addEventListener('change', () => {
     // Change team access mode
     const val = pageContent.querySelector<HTMLInputElement>('input[name=permission]:checked')?.value;
-    toggleElem(pageContent.querySelectorAll('.team-units'), val !== 'admin');
+    toggleElem(pageContent.querySelectorAll('.team-units'), val !== 'admin' && val !== 'write');
   }));
 }