feat(dsa, api): ✨ Introduce core DSA and agency search/priority services

Implement foundational Data Structures and Algorithms (DSA) in `@foia-stream/shared` and integrate them into the `api` service layer for enhanced performance:

- **Trie**: Used in `AgencySearchService` for O(k) prefix-based autocomplete on agency names and abbreviations.
- **Priority Queue (Binary Heap)**: Used in `RequestPriorityService` for O(log n) management of FOIA request queues based on deadlines and urgency.
- **Graph**: Implemented for managing and navigating complex agency hierarchies.
- **Rabin-Karp**: Added for efficient string pattern matching (e.g., future document search/PII detection).

This change significantly improves the efficiency of core application features like search and request prioritization.

Author: WomB0ComB0

.gitignore

@@ -70,3 +70,4 @@ drizzle/meta/
 .drizzle/
 
 ./apps/api/data/*
+./apps/api/data/test*