feat(docs): [Docs] Update CODEBASE_INDEX.md with recent package module additions and contract schemas

[olutundee]

Overview

Updates CODEBASE_INDEX.md to accurately document recent Soroban contract crates (src/amm, src/circuit_breaker, src/flash_loan), contract storage schema patterns, distributed backend worker queue architecture, and refreshed file inventory counts.

Related Issue

Closes #1024

Changes

Documentation & Codebase Index

• [MODIFY] CODEBASE_INDEX.md
  • Updated top-level and subdirectory file counts to match current repository shape.
  • Added detailed documentation for recent Soroban contract crates (src/amm, src/circuit_breaker, src/flash_loan) and all 24 member crates in the root workspace.
  • Documented Soroban contract storage schema patterns (Instance, Persistent, Temporary) and per-crate DataKey mapping.
  • Added dedicated section on the distributed task queue (BullMQ/Redis), worker lifecycle, priority levels, and scheduler catalog.
  • Verified and corrected all relative file path references to ensure 100% path resolution against the active repository structure.

Verification Results

Total backticked expressions checked: 456
Valid paths verified on disk: 178
Missing paths: 0
ALL file path references verified successfully!

Acceptance Criteria	Status
Update repository shape table with current file counts and crate descriptions	✅ Completed
Include src/amm, src/circuit_breaker, and src/flash_loan with descriptions	✅ Completed
Document contract storage schema patterns across Instance, Persistent, and Temporary storage	✅ Completed
Document backend worker queue architecture, BullMQ job types, and schedulers	✅ Completed
Verify all file path references match filesystem structure	✅ Completed

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[Ceejaytech25]

Nice implementation, LGTM!