add crud for general function user process, add pinFriend

[AndrewZuo01]

🔍 What type of PR is this?

👀 What this PR does / why we need it:

• [x ] My pull request adheres to the code style of this project
• [x ] My code requires changes to the documentation
• [x ] I have updated the documentation as required
• [x ] All the tests have passed

add crud for general function user process. For example, add to favorite

🅰 Which issue(s) this PR fixes:

Fixes #

📝 Special notes for your reviewer:

🎯 Describe how to verify it

📑 Additional documentation e.g., RFC, notion, Google docs, usage docs, etc.:

[sweep-ai]

Apply Sweep Rules to your PR?

• Apply: All new business logic should have corresponding unit tests.
• Apply: Refactor large functions to be more modular.
• Apply: Add docstrings to all functions and file headers.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (c8463a0) 5.16% compared to head (9882da6) 5.15%.

Files	Patch %	Lines
pkg/common/convert/friend.go	0.00%	1 Missing ⚠️
pkg/common/http/http_client.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #1532      +/-   ##
========================================
- Coverage   5.16%   5.15%   -0.01%     
========================================
  Files         42      42              
  Lines       3759    3760       +1     
========================================
  Hits         194     194              
- Misses      3554    3555       +1     
  Partials      11      11              

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