fix: update search query validation to disallow empty queries

[Bekiboo]

Description of change

Changed from not allowing less than 2 characters to not allowing empty search.

Issue Number

Closes #692

Type of change

• Fix (a change which fixes an issue)

How the change has been tested

Change NOT tested yet

Change checklist

• I have ensured that the CI Checks pass locally
• I have removed any unnecessary logic
• My code is well documented
• I have signed my commits
• My code follows the pattern of the application
• I have self reviewed my code

Summary by CodeRabbit

Bug Fixes

• Reduced search query minimum length requirement from 2 characters to 1 character across all search features, including user search and name-based queries. This enables users to perform more flexible and granular searches.
• Updated validation error messaging to provide clearer feedback when search input requirements aren't satisfied.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR relaxes the minimum search query length requirement from 2 to 1 character across the Pictique API's user search endpoints and service methods. Error messages are correspondingly updated. The change enables users to initiate searches with single-character queries.

Changes

Cohort / File(s)	Summary
Controller platforms/pictique-api/src/controllers/UserController.ts	Reduced minimum search query length validation from 2 to 1 characters in search and searchByEnameOrName endpoints; updated error message from "Search query must be at least 2 characters long" to "Search query cannot be empty"
Service platforms/pictique-api/src/services/UserService.ts	Lowered search query validation threshold from 2 to 1 character across multiple methods: searchUsers, getSearchUsersCount, getSearchSuggestions, searchUsersByEnameOrName, getSearchUsersByEnameOrNameCount; updated inline comments to reflect new 1-character rule

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~4 minutes

Possibly related PRs

• Fix/pictique search #342: Modifies the same search validation logic in UserController.ts and UserService.ts, establishing the 2-character minimum that this PR relaxes.
• fix: search #341: Updates search query validation across identical files, enforcing stricter constraints on the search functionality.

Poem

🐰 One character now unlocks the way,
No longer must users two letters convey!
A query so brief, just a single hop through,
Pictique's search gleams, refreshed and brand new! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: updating search validation to disallow empty queries rather than queries shorter than 2 characters.
Description check	✅ Passed	The description follows the template with all required sections (change description, issue number, type of change, testing, and checklist) mostly complete, though testing was not performed.
Linked Issues check	✅ Passed	The code changes successfully implement the requirement from issue #692: relaxing search validation from minimum 2 characters to allowing 1-character queries while still blocking empty queries.
Out of Scope Changes check	✅ Passed	All changes are scoped to search validation logic in UserController and UserService, directly addressing the issue requirement with no unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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