feat: Full-text search indexing service (Go + Redis)

[dnviti]

Summary

Add a dedicated Go microservice (search-indexer) that maintains a Redis-backed full-text search index for the Arsenale platform. This will replace the current client-side fuzzy search (cmdk) with server-side indexed search, enabling faster and more comprehensive results.

Motivation

The frontend command palette (Cmd+K) currently performs client-side fuzzy matching using cmdk. This works for small datasets but doesn't scale to:

• Audit events (millions of entries)
• Large connection inventories across tenants
• Full-text search across secret metadata, recordings, settings

A server-side index would provide instant, relevance-ranked results across all entities.

Architecture

• New service: search-indexer (Go, runs in its own container)
• Storage: Redis Search (RediSearch module) for full-text indexing
• Data flow: Subscribes to change events from control-plane-api (via SSE or internal webhook) and maintains the index
• API: REST endpoint (GET /api/search?q=...&scope=...) that the frontend queries
• Port: TBD (follows the existing service port allocation pattern)

Entities to Index

Entity	Fields	Priority
Connections	name, host, type, description, folder name	Phase 1
Secrets (metadata only)	name, type, tags, description	Phase 1
Audit Events	action, target type, user email, IP	Phase 2
Recordings	connection name, protocol, date	Phase 2
Settings Sections	label, description, keywords	Phase 3
Users	username, email, role	Phase 3
Teams	name, description	Phase 3

Phased Rollout

1. Phase 1: Index connections + secret metadata. Frontend falls back to client-side search if service is unavailable.
2. Phase 2: Index audit events + recordings. Add date-range and action-type filters.
3. Phase 3: Full-text search across all entities. Replace cmdk matching entirely.

Frontend Integration

The existing CommandPalette.tsx would gain an optional useServerSearch mode:

• When the indexer is available (feature-flagged), queries go to the API
• Results are rendered in the same CommandGroup / CommandItem structure
• Fallback to client-side search when the service is down

Infrastructure

• Container image built alongside other Go services in backend/cmd/
• Added to the Helm chart and Docker Compose dev stack
• Redis Search module enabled on the existing Redis instance (or a dedicated one)

Labels

enhancement, backend, search