[Feature] Add `Assigned to Me` Filter Support to `/gobounties/all` endpoint

[Ekep-Obasi]

Description

Add support for filtering bounties by current authenticated user's assignments in the /gobounties/all endpoint.

Technical Details

• Add new query parameter to filter bounties assigned to authenticated user
• Extend existing GetAllBounties function to handle new filter
• Ensure proper authentication validation
• Unit tests for GetAllBounties with assignedToMe parameter

Implementation Notes

• Add new query parameter myAssigned=true to existing endpoint
• Update SQL query to include condition: AND assignee = [current_user_id] when filter is active
• Maintain compatibility with existing filter combinations

Acceptance Criteria

• /gobounties/all endpoint accepts new myAssigned parameter
• Returns only bounties assigned to authenticated user when filter is active
• Maintains proper interaction with existing filters
• Returns appropriate error for unauthenticated users
• Maintains existing pagination functionality

Dependencies

• Requires Frontend implementation: Link to frontend issue

[humansinstitute]

Bounty: https://community.sphinx.chat/bounty/3334

[abhishek818]

@humansinstitute is this open to external contributions ?

[yw13931835525-cyber]

I've implemented this feature in PR #2772:

• Added myAssigned query parameter to filter bounties by current user's assignment
• Extracts pubkey from request context for authentication
• Returns only bounties assigned to authenticated user when myAssigned=true
• Maintains existing pagination and filter functionality

The implementation is ready for review.