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>

models/organization/team_repo.go

@@ -52,7 +52,6 @@ func RemoveTeamRepo(ctx context.Context, teamID, repoID int64) error {
 
 // GetTeamsWithAccessToAnyRepoUnit returns all teams in an organization that have given access level to the repository special unit.
 // This function is only used for finding some teams that can be used as branch protection allowlist or reviewers, it isn't really used for access control.
-// FIXME: TEAM-UNIT-PERMISSION this logic is not complete, search the fixme keyword to see more details
 func GetTeamsWithAccessToAnyRepoUnit(ctx context.Context, orgID, repoID int64, mode perm.AccessMode, unitType unit.Type, unitTypesMore ...unit.Type) (teams []*Team, err error) {
 	teamIDs, err := getTeamIDsWithAccessToAnyRepoUnit(ctx, orgID, repoID, mode, unitType, unitTypesMore...)
 	if err != nil {