Andrei 5cc00b2876 feat: Implement AI streaming responses with SSE and deployment infrastructure ...

This commit adds comprehensive AI response streaming and critical deployment features:

## AI Streaming Implementation
- **Backend StreamingService**: Token-by-token Azure OpenAI streaming (163 lines)
  - SSE endpoint at POST /api/v1/ai/chat/stream
  - Buffer management for incomplete SSE events
  - Stream callback architecture with chunk types (token, done, error)
- **Frontend useStreamingChat Hook**: Fetch API with ReadableStream (127 lines)
  - Token accumulation with state management
  - Error handling and completion callbacks
- **UI Integration**: Streaming message bubble with animated blinking cursor
  - Auto-scroll as tokens arrive
  - Loading indicator while waiting for first token
  - Seamless transition from streaming to completed message
- **Safety Integration**: All safety checks preserved
  - Rate limiting and input sanitization
  - Context building reused from chat() method

## Deployment Infrastructure (Previous Session)
- **Environment Configuration System**:
  - .env.example with 140+ configuration options
  - .env.staging and .env.production templates
  - Typed configuration service (environment.config.ts, 200 lines)
  - Environment-specific settings for DB, Redis, backups, AI
- **Secret Management**:
  - Provider abstraction for AWS Secrets Manager, HashiCorp Vault, env vars
  - 5-minute caching with automatic refresh (secrets.service.ts, 189 lines)
  - Batch secret retrieval and validation
- **Database Backup System**:
  - Automated PostgreSQL/MongoDB backups with cron scheduling
  - pg_dump + gzip compression, 30-day retention
  - S3 upload integration (backup.service.ts, 306 lines)
  - Admin endpoints for manual operations
  - Comprehensive documentation (BACKUP_STRATEGY.md, 343 lines)
- **Health Check Monitoring**:
  - Kubernetes-ready health probes (liveness/readiness/startup)
  - Custom health indicators for Redis, MongoDB, MinIO, Azure OpenAI
  - Response time tracking (health.controller.ts, 108 lines)

## Files Modified
- maternal-web/components/features/ai-chat/AIChatInterface.tsx
- maternal-app/maternal-app-backend/src/modules/ai/ai.service.ts
- maternal-app/maternal-app-backend/src/modules/ai/ai.module.ts
- docs/implementation-gaps.md (updated feature counts: 62/128 complete, 48%)

## Files Created
- maternal-web/hooks/useStreamingChat.ts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-10-03 22:35:31 +00:00

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