feat: validate resolver belongs to same organization

[google-labs-jules]

Adds a database query ValidateDoubtResolverOrg to ensure the doubt resolver and mentee belong to the same organization. Updates ResolveDoubt service to perform this check.

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PR created automatically by Jules for task 14529915556452121114 started by @Gautam7352

[google-labs-jules]

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Project	Deployment	Actions	Updated (UTC)
coderz-space	Error		Apr 1, 2026 9:57pm