Maithili: instagram autoposter changes be

[maithili20]

Description

This is backend PR for instagram autoposter.
Following things are covered in this PR

1. Create Post
2. Schedule Post, Edit and Delete scheduled posts.
3. History of posts.

Related PRS (if any):

To test this backend PR you need to checkout the PR5478 frontend PR.
…

Main changes explained:

A document explaining all changes is attached.
https://www.dropbox.com/scl/fi/dti6xvyfctg6fbi8v71dk/Instagram-Autoposter-Setup-and-Process-Guide.pages?rlkey=vyli8kr940fh7y4w4xyhs97bw&st=ehi5f2bw&dl=0

How to test:

1. check into current branch
2. do npm install and ... to run this PR locally
3. Clear site data/cache
4. log as admin user
5. go to dashboard→ Other Links→ Send Emails → Instagram

Screenshots or videos of changes:

https://www.dropbox.com/scl/fi/ldllbju33582cqvr84ij9/screen-recording-2026-10-09-at-100555-am_CrCB54kh.mov?rlkey=ggoml1qb6grnrck0e7qstum2x&st=r9fevez4&dl=0

[sonarqubecloud]

Quality Gate passed

Issues
7 New issues
0 Accepted issues

Measures
0 Security Hotspots
82.5% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud