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>
Andrei
5cc00b2876