赵月辉 / fastgpt-migrated

* fix: make mongo index sync non-destructive

* feat: add safe mongo index maintenance

* docs: document mongo index sync modes

* refactor: simplify mongo index synchronization

* refactor: reduce mongo index sync logs

* refactor: unify mongo index declarations

* docs: consolidate mongo index design notes

* refactor: simplify mongo index declarations

* docs: clarify legacy index cleanup upgrade path

* docs: clarify MongoDB deprecated index cleanup

* fix: match deprecated text indexes by weights, drop options check

Allow name+key cleanup for MongoDB text indexes whose stored key is
rewritten to _fts/_ftsx, and stop requiring options equality so valid
deprecations are not blocked by declaration noise.

* fix: keep agent skill folder tree index active

Restore { teamId, parentId, deleteTime } as a current Schema index so
findSkillAndAllChildren can use it and startup cleanup will not drop it.

* fix: align pro submodule for admin build

---------

Co-authored-by: Archer <545436317@qq.com>