Database optimization: add missing indexes, refactor redundant queries

[ZeePearl56]

Closes #73

Summary

Implements comprehensive database optimization for #73. Adds 11 missing indexes across 7 tables, removes redundant query patterns, and documents the full index strategy.

Indexes Added (11 total)

• snippets: owner_created, deleted_owner (partial)
• snippet_verifications: snippet_active, wallet_active (partial)
• verification_attempt_logs: snippet_time
• snippet_permissions: snippet_grantee_active, active_granted (partial)
• permission_activity_log: snippet_created
• marketplace_listings: status_created
• marketplace_purchases: buyer_purchased, listing_buyer_status
• marketplace_audit_logs: entity_type_created

Redundant Query Refactors

File	Fix	Savings
snippet.service.ts:updateSnippet	Removed redundant findById	-1 query
snippet.service.ts:deleteSnippet	Removed redundant findById	-1 query
snippet.service.ts:restoreSnippet	Removed raw SQL, enhanced restore()	-1 query
snippet.service.ts:permanentlyDeleteSnippet	Removed raw SQL, used RETURNING *	-1 query
snippet.repository.ts	Added is_deleted guards to update/delete/restore	Data integrity
[id]/route.ts:GET	Inlined owner check to skip getSnippetOwner	-1 query
[id]/route.ts:DELETE	Fixed pre-existing dead code after early return	Bug fix

New Files

• scripts/migrations/001_add_performance_indexes.sql
• scripts/run-optimization-migration.ts
• docs/database-optimization.md

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