Add non-persoanlized recommendation digest

[zhenghaoz]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 72.27723% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.81%. Comparing base (e3d7faf) to head (2220dd4).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
logics/recommend.go	64.61%	16 Missing and 7 partials ⚠️
master/rest.go	33.33%	0 Missing and 2 partials ⚠️
worker/worker.go	81.81%	0 Missing and 2 partials ⚠️
master/tasks.go	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1086      +/-   ##
==========================================
+ Coverage   70.79%   70.81%   +0.02%     
==========================================
  Files          87       87              
  Lines       15028    15081      +53     
==========================================
+ Hits        10639    10680      +41     
- Misses       3348     3355       +7     
- Partials     1041     1046       +5     

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[Copilot]

Pull Request Overview

This PR refactors the recommendation caching system by renaming cache keys for consistency and introducing digest-based cache validation to track configuration changes. The changes consolidate various offline recommendation cache keys under a unified Recommend namespace and add digest tracking to detect when recommendation configurations have changed.

Key Changes

• Renamed cache constants from OfflineRecommend* to Recommend* and similar naming improvements for consistency
• Modified recommender functions to return digests alongside scores for cache validation
• Added new util.MD5() function that computes order-independent hashes of strings

Reviewed Changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
storage/cache/database.go	Consolidated and renamed cache key constants for recommendations, added digest constants for all recommender types
logics/recommend.go	Updated all recommender functions to return digests, added external recommender support with recommendExternal()
logics/recommend_test.go	Added test coverage for digest returns in all recommender functions and new external recommender test
worker/worker.go	Integrated digest capture and storage when generating recommendations
worker/worker_test.go	Updated all tests to use new cache key names and added digest validation test
config/config.go	Refactored Hash() to use new util.MD5() for order-independent digest computation
common/util/util.go	Added new MD5() utility function for computing order-independent hashes
server/rest.go	Updated REST endpoints to use new cache key names
server/rest_test.go	Updated test assertions to use new cache key names
master/tasks.go	Added digest storage for non-personalized recommenders
master/tasks_test.go	Added digest validation tests for item-to-item and user-to-user recommenders
master/rest.go	Updated REST endpoints to use new cache key names and handle digest returns
client/client_test.go	Updated test to use new recommend cache key name
.github/workflows/dockerhub-description.yml	Added checkout step before resolving images in README

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