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/repo/repo_list.go

@@ -310,15 +310,12 @@ func userOrgTeamRepoBuilder(userID int64) *builder.Builder {
 }
 
 // userOrgTeamUnitRepoBuilder returns repo ids where user's teams can access the special unit.
-// A team grants the unit either through an explicit team_unit row (access_mode > none) or by being an
-// admin/owner team (team.authorize >= admin), which grants every unit regardless of team_unit rows —
-// mirroring the HasAdminAccess() short-circuit in access.GetIndividualUserRepoPermission.
 func userOrgTeamUnitRepoBuilder(userID int64, unitType unit.Type) *builder.Builder {
 	return userOrgTeamRepoBuilder(userID).
 		Join("INNER", "team", "`team`.id = `team_repo`.team_id").
 		Join("LEFT", "team_unit", builder.Expr("`team_unit`.team_id = `team_repo`.team_id AND `team_unit`.`type` = ?", unitType)).
 		Where(builder.Or(
-			builder.Gte{"`team`.authorize": int(perm.AccessModeAdmin)},
+			builder.Gt{"`team`.authorize": int(perm.AccessModeNone)},
 			builder.Gt{"`team_unit`.`access_mode`": int(perm.AccessModeNone)},
 		))
 }