docs(backend): consolidate BACKEND_ISSUES.md catalog

[Adiz4415]

Summary

Mirrors the contracts-catalog consolidation (PR #22) onto the backend. Restructures PROJECT/issues/BACKEND_ISSUES.md into the canonical severity/area/evidence/impact/fix/acceptance format used by issues/backend.md, expanding coverage from 56 to 75 catalog entries with stable B-### IDs.

What changed

• Restructured PROJECT/issues/BACKEND_ISSUES.md from a 56-item annotated list into the canonical severity/area/evidence/impact/fix/acceptance format used by issues/backend.md.
• Coverage expanded from 56 to 75 catalog entries, fully aligned with issues/backend.md (B-001 through B-075). Severity distribution: 2 Critical, 21 High, 38 Medium, 14 Low (verified unique IDs).
• Legacy 56-item list preserved as Section 7 cross-reference with (moved) / (new) tags. New findings propose follow-up canonical IDs (e.g. legacy CONTRIBUTING_GUIDE.MD #1 bcrypt salt bug mapped to proposed B-076).
• Added structural sections mirroring PR docs(contracts): consolidate CONTRACTS_ISSUES.md to close #12 #22 pattern: Summary Table, Severity Counts, Resolution Tracker (Section 8), Top Remediations (ship-safety order), Cross-Reference Map, Maintenance guidelines.
• Acceptance criteria included for every entry so each issue can be unambiguously verified when fixed.

Why

Following the established pattern from PR #22 (issue #12, contracts catalog), this consolidates backend MVP flaws into a durable reference. This file is the durable long-form version; issues/backend.md remains the live triage-ready catalog and is now faithfully mirrored.

Verification

• IDs B-001 through B-075 all present and unique (75 verified).
• Severity counts tally: 2 + 21 + 38 + 14 = 75 (matches issues/backend.md).
• Cross-reference paths from PROJECT/issues/ to companion files resolve: ../../issues/backend.md, ../CONTRACTS_ISSUES.md, ../SMART_CONTRACT_SPEC.md, ../../TECHNICAL/..., ../../correction.md.
• Legacy list preserved as Section 7 with explicit (moved) / (new) tags.

Related

• Mirrors PR docs(contracts): consolidate CONTRACTS_ISSUES.md to close #12 #22 pattern
• Mirrors issues/backend.md
• Preserves legacy content from prior PROJECT/issues/BACKEND_ISSUES.md

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f7864fa8-82ea-4a62-8a2f-3e6d581fb483

📥 Commits

Reviewing files that changed from the base of the PR and between ea8aa4b and 6583ac6.

📒 Files selected for processing (2)

• PROJECT/issues/BACKEND_ISSUES.md
• PROJECT/issues/CONTRACTS_ISSUES.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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