IAV-990/ AI Agent management – CRUD, platform integrations & features

Summary

• AI Agents CRUD: AIAgentController with create/update/delete/search/filter, status management, avatar upload & deletion, and pagination support
• Platform Integrations: AIPlatformIntegrationController to manage agent integrations (Shopify, WhatsApp, etc.) with icon upload, status control, and full CRUD
• Agent Features: AgentFeatureController to add/update/delete features per agent, with lookup by agent name
• Service layer: interfaces + implementations for all three domains, backed by AIAgentRepository, IntegrationRepository, and AgentFeatureRepository
• DTOs: request/response DTOs for agents, integrations, and features
• Error codes: new ORCH_040–046 errors for agent-specific functional failures
• Swagger: added SwaggerConfig + springdoc-openapi-starter-webmvc-ui 2.5.0
• Entity scan: added orchestration.entities package to @EntityScan
• Added messages_en/fr/ar.properties for internationalized error messages
• Dependency: bumped iavia-common from 0.0.111 to 0.0.120