Adds a Platform API endpoint that allows migrating existing Google and
Microsoft email channels (with OAuth credentials) into Chatwoot without
requiring end-users to re-authenticate. This enables customers who lack
Rails console access to programmatically migrate email channels from
legacy systems.
### How to test
1. Create a Platform App and grant it permissible access to a target
account
2. `POST /platform/api/v1/accounts/:account_id/email_channel_migrations`
with a payload like:
```json
{
"migrations": [
{
"email": "support@example.com",
"provider": "google",
"provider_config": {
"access_token": "...",
"refresh_token": "...",
"expires_on": "..."
},
"inbox_name": "Migrated Support"
}
]
}
```
3. Verify channels are created with correct provider, provider_config, and IMAP defaults
4. Verify partial failures (e.g. duplicate email) don't roll back other migrations in the batch
5. Verify unauthenticated and non-permissible requests return 401
---------
Co-authored-by: Sojan Jose <sojan@pepalo.com>
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