feat(v1.2): Real-Time Observability Dashboard

[Steffen025]

Summary

Complete monitoring infrastructure for PAI-OpenCode with real-time event streaming, SQLite persistence, and a Vue 3 dashboard.

What's New

Observability Server (:8889)

• Bun HTTP server with REST API and SSE streaming
• SQLite database with 30-day retention
• 14 event types captured across all plugin hooks

Vue 3 Dashboard

• Dashboard: Real-time stats + live event stream
• Events: Searchable/filterable browser with pagination
• Sessions: Expandable session viewer
• GitHub Dark theme (#0d1117)

Plugin Integration

• New observability-emitter.ts handler
• Fire-and-forget pattern (1s timeout, non-blocking)
• +82 lines in pai-unified.ts

API Endpoints

Endpoint	Method	Purpose
/health	GET	Health check
/events	POST	Event ingestion
/api/events	GET	Query events
/api/events/stream	GET	SSE real-time
/api/sessions	GET	Query sessions
/api/stats	GET	Statistics

Testing

• ✅ Server starts and responds to health checks
• ✅ Event ingestion works
• ✅ SQLite persistence works
• ✅ Stats aggregation works
• ✅ Dashboard builds successfully

Files Changed

.opencode/observability-server/     # NEW - Server + Dashboard
.opencode/plugins/handlers/observability-emitter.ts  # NEW
.opencode/plugins/pai-unified.ts    # +82 lines
docs/specs/OBSERVABILITY-SERVER-SPEC.md  # NEW
CHANGELOG.md                        # Updated