docs: add fuzzy search and relevance ordering documentation

[docloulou]

Add documentation for the new fuzzy and fuzzyContains filter
operators and _relevance ordering, available on PostgreSQL only.

linked to : zenstackhq/zenstack#2573

Summary by CodeRabbit

• Documentation
  • Added detailed documentation for new fuzzy search filter operators exclusively available for PostgreSQL databases, providing powerful and flexible string matching capabilities.
  • Documented their implementation across queries and mutation operations, relevance-based result sorting functionality, required setup prerequisites, and important pagination limitations to consider.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: dc7e4595-46b4-4727-aec3-90d3b1ba7899

📥 Commits

Reviewing files that changed from the base of the PR and between 51f95aa and dfc105e.

📒 Files selected for processing (2)

• docs/orm/api/filter.md
• docs/orm/api/find.md

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Walkthrough

Two documentation files were updated to introduce fuzzy search filtering capabilities for PostgreSQL. The primary documentation in filter.md covers fuzzy search filters with prerequisites, operator semantics, usage examples, and relevance-based sorting. A cross-reference was added to find.md noting fuzzy search relevance sorting availability.

Changes

Cohort / File(s)	Summary
Fuzzy search filters documentation docs/orm/api/filter.md	Added comprehensive guide for fuzzy search filters including fuzzy and fuzzyContains operators, pg_trgm/unaccent prerequisites, operator semantics, examples with combined filters, and relevance-based sorting via _relevance field with pagination cautions.
Sorting reference docs/orm/api/find.md	Added brief note linking to fuzzy search relevance sorting capabilities from the Sorting section.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately summarizes the main change: adding documentation for fuzzy search filters and relevance-based ordering, which is the primary focus of both modified files.
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 unit tests (beta)

• Create PR with unit tests

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